256878635955 has 8 divisors (see below), whose sum is σ = 411005817552. Its totient is φ = 137001939168.

The previous prime is 256878635927. The next prime is 256878635957. The reversal of 256878635955 is 559536878652.

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

It is not a de Polignac number, because 256878635955 - 2¹⁰ = 256878634931 is a prime.

It is a super-2 number, since 2×256878635955² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256878635955.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8562621184 + ... + 8562621213.

It is an arithmetic number, because the mean of its divisors is an integer number (51375727194).

Almost surely, 2^256878635955 is an apocalyptic number.

256878635955 is a deficient number, since it is larger than the sum of its proper divisors (154127181597).

256878635955 is a wasteful number, since it uses less digits than its factorization.

256878635955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17125242405.

The product of its digits is 544320000, while the sum is 69.

The spelling of 256878635955 in words is "two hundred fifty-six billion, eight hundred seventy-eight million, six hundred thirty-five thousand, nine hundred fifty-five".