256661711035275 has 48 divisors (see below), whose sum is σ = 522273676623104. Its totient is φ = 108305601137280.

The previous prime is 256661711035253. The next prime is 256661711035297. The reversal of 256661711035275 is 572530117166652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256661711035253) and next prime (256661711035297).

It is not a de Polignac number, because 256661711035275 - 2¹⁶ = 256661710969739 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18803048929 + ... + 18803062578.

Almost surely, 2^{256661711035275} is an apocalyptic number.

256661711035275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256661711035275 is an abundant number, since it is smaller than the sum of its proper divisors (265611965587829).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256661711035275 is a wasteful number, since it uses less digits than its factorization.

256661711035275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37606111540 (or 37606111535 counting only the distinct ones).

The product of its (nonzero) digits is 15876000, while the sum is 57.

The spelling of 256661711035275 in words is "two hundred fifty-six trillion, six hundred sixty-one billion, seven hundred eleven million, thirty-five thousand, two hundred seventy-five".