256249767555 has 24 divisors (see below), whose sum is σ = 444208735152. Its totient is φ = 136653474624.

The previous prime is 256249767547. The next prime is 256249767577. The reversal of 256249767555 is 555767942652.

256249767555 is a `hidden beast` number, since 2 + 5 + 6 + 2 + 4 + 9 + 76 + 7 + 555 = 666.

It is not a de Polignac number, because 256249767555 - 2³ = 256249767547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256249767492 and 256249767501.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 213097 + ... + 746933.

It is an arithmetic number, because the mean of its divisors is an integer number (18508697298).

Almost surely, 2^256249767555 is an apocalyptic number.

256249767555 is a deficient number, since it is larger than the sum of its proper divisors (187958967597).

256249767555 is a wasteful number, since it uses less digits than its factorization.

256249767555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544515 (or 544512 counting only the distinct ones).

The product of its digits is 158760000, while the sum is 63.

The spelling of 256249767555 in words is "two hundred fifty-six billion, two hundred forty-nine million, seven hundred sixty-seven thousand, five hundred fifty-five".