256145855164 has 48 divisors (see below), whose sum is σ = 459478365696. Its totient is φ = 124887276800.

The previous prime is 256145855129. The next prime is 256145855197. The reversal of 256145855164 is 461558541652.

It is a super-2 number, since 2×256145855164² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73371459 + ... + 73374949.

It is an arithmetic number, because the mean of its divisors is an integer number (9572465952).

Almost surely, 2^256145855164 is an apocalyptic number.

It is an amenable number.

256145855164 is a deficient number, since it is larger than the sum of its proper divisors (203332510532).

256145855164 is a wasteful number, since it uses less digits than its factorization.

256145855164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4866 (or 4864 counting only the distinct ones).

The product of its digits is 5760000, while the sum is 52.

The spelling of 256145855164 in words is "two hundred fifty-six billion, one hundred forty-five million, eight hundred fifty-five thousand, one hundred sixty-four".