77970518256 has 40 divisors (see below), whose sum is σ = 201434341504. Its totient is φ = 25988817600.

The previous prime is 77970518239. The next prime is 77970518257. The reversal of 77970518256 is 65281507977.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 77970518196 and 77970518205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77970518257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1380981 + ... + 1436331.

Almost surely, 2^77970518256 is an apocalyptic number.

It is an amenable number.

77970518256 is an abundant number, since it is smaller than the sum of its proper divisors (123463823248).

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

77970518256 is a wasteful number, since it uses less digits than its factorization.

77970518256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84709 (or 84703 counting only the distinct ones).

The product of its (nonzero) digits is 7408800, while the sum is 57.

The spelling of 77970518256 in words is "seventy-seven billion, nine hundred seventy million, five hundred eighteen thousand, two hundred fifty-six".