256578145858 has 8 divisors (see below), whose sum is σ = 384873394752. Its totient is φ = 128287014276.

The previous prime is 256578145829. The next prime is 256578145951. The reversal of 256578145858 is 858541875652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 256578145858.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 868510 + ... + 1125817.

It is an arithmetic number, because the mean of its divisors is an integer number (48109174344).

Almost surely, 2^256578145858 is an apocalyptic number.

256578145858 is a deficient number, since it is larger than the sum of its proper divisors (128295248894).

256578145858 is a wasteful number, since it uses less digits than its factorization.

256578145858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058656.

The product of its digits is 107520000, while the sum is 64.

The spelling of 256578145858 in words is "two hundred fifty-six billion, five hundred seventy-eight million, one hundred forty-five thousand, eight hundred fifty-eight".