256653766593 has 32 divisors (see below), whose sum is σ = 440666449920. Its totient is φ = 144593663760.

The previous prime is 256653766573. The next prime is 256653766661. The reversal of 256653766593 is 395667356652.

256653766593 is a `hidden beast` number, since 2 + 5 + 6 + 6 + 5 + 37 + 6 + 6 + 593 = 666.

It is not a de Polignac number, because 256653766593 - 2⁸ = 256653766337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 256653766593.

It is not an unprimeable number, because it can be changed into a prime (256653766513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9549655 + ... + 9576492.

It is an arithmetic number, because the mean of its divisors is an integer number (13770826560).

Almost surely, 2^256653766593 is an apocalyptic number.

It is an amenable number.

256653766593 is a deficient number, since it is larger than the sum of its proper divisors (184012683327).

256653766593 is a wasteful number, since it uses less digits than its factorization.

256653766593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19126234 (or 19126228 counting only the distinct ones).

The product of its digits is 183708000, while the sum is 63.

The spelling of 256653766593 in words is "two hundred fifty-six billion, six hundred fifty-three million, seven hundred sixty-six thousand, five hundred ninety-three".