65557774656 has 112 divisors (see below), whose sum is σ = 210248479680. Its totient is φ = 19865986560.

The previous prime is 65557774631. The next prime is 65557774661. The reversal of 65557774656 is 65647775556.

65557774656 is a `hidden beast` number, since 6 + 5 + 5 + 577 + 7 + 4 + 6 + 56 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 65557774593 and 65557774602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1705471 + ... + 1743486.

Almost surely, 2^65557774656 is an apocalyptic number.

65557774656 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

65557774656 is an abundant number, since it is smaller than the sum of its proper divisors (144690705024).

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

65557774656 is a wasteful number, since it uses less digits than its factorization.

65557774656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3448989 (or 3448973 counting only the distinct ones).

The product of its digits is 185220000, while the sum is 63.

The spelling of 65557774656 in words is "sixty-five billion, five hundred fifty-seven million, seven hundred seventy-four thousand, six hundred fifty-six".