256135801165 has 16 divisors (see below), whose sum is σ = 311775246000. Its totient is φ = 201970755072.

The previous prime is 256135801139. The next prime is 256135801193. The reversal of 256135801165 is 561108531652.

256135801165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 16738925641 + 239396875524 = 129379^2 + 489282^2 .

It is a cyclic number.

It is not a de Polignac number, because 256135801165 - 2⁵ = 256135801133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338871 + ... + 791899.

It is an arithmetic number, because the mean of its divisors is an integer number (19485952875).

Almost surely, 2^256135801165 is an apocalyptic number.

It is an amenable number.

256135801165 is a deficient number, since it is larger than the sum of its proper divisors (55639444835).

256135801165 is a wasteful number, since it uses less digits than its factorization.

256135801165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454656.

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 256135801165 in words is "two hundred fifty-six billion, one hundred thirty-five million, eight hundred one thousand, one hundred sixty-five".