256878635954 has 8 divisors (see below), whose sum is σ = 385373043948. Its totient is φ = 128420954640.

The previous prime is 256878635927. The next prime is 256878635957. The reversal of 256878635954 is 459536878652.

It can be written as a sum of positive squares in 2 ways, for example, as 229466866729 + 27411769225 = 479027^2 + 165565^2 .

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

It is a super-2 number, since 2×256878635954² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256878635957) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9164177 + ... + 9192164.

Almost surely, 2^256878635954 is an apocalyptic number.

256878635954 is a deficient number, since it is larger than the sum of its proper divisors (128494407994).

256878635954 is a wasteful number, since it uses less digits than its factorization.

256878635954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18363340.

The product of its digits is 435456000, while the sum is 68.

The spelling of 256878635954 in words is "two hundred fifty-six billion, eight hundred seventy-eight million, six hundred thirty-five thousand, nine hundred fifty-four".