66604660415256 has 16 divisors (see below), whose sum is σ = 166511651038200. Its totient is φ = 22201553471744.

The previous prime is 66604660415239. The next prime is 66604660415257. The reversal of 66604660415256 is 65251406640666.

It is a junction number, because it is equal to n+sod(n) for n = 66604660415196 and 66604660415205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66604660415257) 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, 1387597091961 + ... + 1387597092008.

Almost surely, 2^{66604660415256} is an apocalyptic number.

It is an amenable number.

66604660415256 is an abundant number, since it is smaller than the sum of its proper divisors (99906990622944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66604660415256 is a wasteful number, since it uses less digits than its factorization.

66604660415256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775194183978 (or 2775194183974 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 57.

The spelling of 66604660415256 in words is "sixty-six trillion, six hundred four billion, six hundred sixty million, four hundred fifteen thousand, two hundred fifty-six".