7777660056 has 32 divisors (see below), whose sum is σ = 19456763760. Its totient is φ = 2590871552.

The previous prime is 7777660039. The next prime is 7777660057. The reversal of 7777660056 is 6500667777.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7777659990 and 7777660008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7777660057) 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, 67065 + ... + 141608.

Almost surely, 2^7777660056 is an apocalyptic number.

It is an amenable number.

7777660056 is an abundant number, since it is smaller than the sum of its proper divisors (11679103704).

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

7777660056 is a wasteful number, since it uses less digits than its factorization.

7777660056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210235 (or 210231 counting only the distinct ones).

The product of its (nonzero) digits is 2593080, while the sum is 51.

The square root of 7777660056 is about 88191.0429465487. The cubic root of 7777660056 is about 1981.2973214079.

The spelling of 7777660056 in words is "seven billion, seven hundred seventy-seven million, six hundred sixty thousand, fifty-six".