256846861178 has 4 divisors (see below), whose sum is σ = 385270291770. Its totient is φ = 128423430588.

The previous prime is 256846861177. The next prime is 256846861199. The reversal of 256846861178 is 871168648652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 221715731689 + 35131129489 = 470867^2 + 187433^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 256846861178.

It is not an unprimeable number, because it can be changed into a prime (256846861177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64211715293 + ... + 64211715296.

Almost surely, 2^256846861178 is an apocalyptic number.

256846861178 is a deficient number, since it is larger than the sum of its proper divisors (128423430592).

256846861178 is a wasteful number, since it uses less digits than its factorization.

256846861178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128423430591.

The product of its digits is 30965760, while the sum is 62.

The spelling of 256846861178 in words is "two hundred fifty-six billion, eight hundred forty-six million, eight hundred sixty-one thousand, one hundred seventy-eight".