256615611555060 has 36 divisors (see below), whose sum is σ = 778400688384228. Its totient is φ = 68430829747968.

The previous prime is 256615611555047. The next prime is 256615611555077. The reversal of 256615611555060 is 60555116516652.

256615611555060 is a `hidden beast` number, since 2 + 5 + 6 + 6 + 1 + 561 + 15 + 5 + 5 + 0 + 60 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 168274184978916 + 88341426576144 = 12972054^2 + 9399012^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 256615611554988 and 256615611555006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 712821143029 + ... + 712821143388.

Almost surely, 2^{256615611555060} is an apocalyptic number.

256615611555060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256615611555060 is an abundant number, since it is smaller than the sum of its proper divisors (521785076829168).

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

256615611555060 is a wasteful number, since it uses less digits than its factorization.

256615611555060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425642286432 (or 1425642286427 counting only the distinct ones).

The product of its (nonzero) digits is 8100000, while the sum is 54.

The spelling of 256615611555060 in words is "two hundred fifty-six trillion, six hundred fifteen billion, six hundred eleven million, five hundred fifty-five thousand, sixty".