77646165455656 has 24 divisors (see below), whose sum is σ = 169355794553370. Its totient is φ = 33276928052256.

The previous prime is 77646165455609. The next prime is 77646165455689. The reversal of 77646165455656 is 65655456164677.

It can be written as a sum of positive squares in only one way, i.e., 63398062044100 + 14248103411556 = 7962290^2 + 3774666^2 .

It is a super-2 number, since 2×77646165455656² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 99038475955 + ... + 99038476738.

Almost surely, 2^{77646165455656} is an apocalyptic number.

It is an amenable number.

77646165455656 is an abundant number, since it is smaller than the sum of its proper divisors (91709629097714).

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

77646165455656 is a wasteful number, since it uses less digits than its factorization.

77646165455656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198076952713 (or 198076952702 counting only the distinct ones).

The product of its digits is 3810240000, while the sum is 73.

The spelling of 77646165455656 in words is "seventy-seven trillion, six hundred forty-six billion, one hundred sixty-five million, four hundred fifty-five thousand, six hundred fifty-six".