66750331 has 4 divisors (see below), whose sum is σ = 68554432. Its totient is φ = 64946232.

The previous prime is 66750329. The next prime is 66750349. The reversal of 66750331 is 13305766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66750331 - 2¹ = 66750329 is a prime.

It is a super-2 number, since 2×66750331² = 8911213377219122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66750293 and 66750302.

It is not an unprimeable number, because it can be changed into a prime (66750391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 901995 + ... + 902068.

It is an arithmetic number, because the mean of its divisors is an integer number (17138608).

Almost surely, 2^66750331 is an apocalyptic number.

66750331 is a deficient number, since it is larger than the sum of its proper divisors (1804101).

66750331 is a wasteful number, since it uses less digits than its factorization.

66750331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804100.

The product of its (nonzero) digits is 11340, while the sum is 31.

The square root of 66750331 is about 8170.0875760300. The cubic root of 66750331 is about 405.6496832565.

It can be divided in two parts, 66750 and 331, that added together give a square (67081 = 259²).

The spelling of 66750331 in words is "sixty-six million, seven hundred fifty thousand, three hundred thirty-one".