256628780026331 has 8 divisors (see below), whose sum is σ = 261471098250000. Its totient is φ = 251786471646112.

The previous prime is 256628780026321. The next prime is 256628780026357. The reversal of 256628780026331 is 133620087826652.

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

It is a cyclic number.

It is not a de Polignac number, because 256628780026331 - 2²² = 256628775832027 is a prime.

It is a super-2 number, since 2×256628780026331² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256628780026321) 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, 70254920 + ... + 73817418.

It is an arithmetic number, because the mean of its divisors is an integer number (32683887281250).

Almost surely, 2^{256628780026331} is an apocalyptic number.

256628780026331 is a deficient number, since it is larger than the sum of its proper divisors (4842318223669).

256628780026331 is a wasteful number, since it uses less digits than its factorization.

256628780026331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4921725.

The product of its (nonzero) digits is 34836480, while the sum is 59.

The spelling of 256628780026331 in words is "two hundred fifty-six trillion, six hundred twenty-eight billion, seven hundred eighty million, twenty-six thousand, three hundred thirty-one".