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66372481 = 741281823
BaseRepresentation
bin1111110100110…
…0001110000001
311121220001221001
43331030032001
5113442404411
610330332001
71434104530
oct375141601
9147801831
1066372481
113451369a
121a28a001
131099b676
148b5a317
155c60dc1
hex3f4c381

66372481 has 16 divisors (see below), whose sum is σ = 78075648. Its totient is φ = 55238400.

The previous prime is 66372431. The next prime is 66372511. The reversal of 66372481 is 18427366.

66372481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

66372481 is a nontrivial binomial coefficient, being equal to C(11522, 2).

It is a de Polignac number, because none of the positive numbers 2k-66372481 is a prime.

It is a super-2 number, since 2×663724812 = 8810612468190722, which contains 22 as substring.

Its product of digits (48384) is a multiple of the sum of its prime divisors (1152).

It is a self number, because there is not a number n which added to its sum of digits gives 66372481.

It is not an unprimeable number, because it can be changed into a prime (66372401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80236 + ... + 81058.

It is an arithmetic number, because the mean of its divisors is an integer number (4879728).

Almost surely, 266372481 is an apocalyptic number.

66372481 is the 11521-st triangular number and also the 5761-st hexagonal number.

66372481 is the 3841-st centered nonagonal number.

It is an amenable number.

66372481 is a deficient number, since it is larger than the sum of its proper divisors (11703167).

66372481 is a wasteful number, since it uses less digits than its factorization.

66372481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152.

The product of its digits is 48384, while the sum is 37.

The square root of 66372481 is about 8146.9307717692. The cubic root of 66372481 is about 404.8828213558.

The spelling of 66372481 in words is "sixty-six million, three hundred seventy-two thousand, four hundred eighty-one".

Divisors: 1 7 41 281 287 823 1967 5761 11521 33743 80647 231263 236201 1618841 9481783 66372481