66951405 has 12 divisors (see below), whose sum is σ = 116049180. Its totient is φ = 35707392.

The previous prime is 66951403. The next prime is 66951419. The reversal of 66951405 is 50415966.

It can be written as a sum of positive squares in 2 ways, for example, as 8749764 + 58201641 = 2958^2 + 7629^2 .

It is not a de Polignac number, because 66951405 - 2¹ = 66951403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66951405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66951403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 743860 + ... + 743949.

It is an arithmetic number, because the mean of its divisors is an integer number (9670765).

Almost surely, 2^66951405 is an apocalyptic number.

It is an amenable number.

66951405 is a deficient number, since it is larger than the sum of its proper divisors (49097775).

66951405 is a wasteful number, since it uses less digits than its factorization.

66951405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487820 (or 1487817 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 66951405 is about 8182.3838213567. The cubic root of 66951405 is about 406.0565918024.

It can be divided in two parts, 6695 and 1405, that added together give a square (8100 = 90²).

The spelling of 66951405 in words is "sixty-six million, nine hundred fifty-one thousand, four hundred five".