256606655165 has 16 divisors (see below), whose sum is σ = 351935966208. Its totient is φ = 175949715456.

The previous prime is 256606655141. The next prime is 256606655177. The reversal of 256606655165 is 561556606652.

It is a cyclic number.

It is not a de Polignac number, because 256606655165 - 2¹² = 256606651069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 532244 + ... + 892466.

It is an arithmetic number, because the mean of its divisors is an integer number (21995997888).

Almost surely, 2^256606655165 is an apocalyptic number.

It is an amenable number.

256606655165 is a deficient number, since it is larger than the sum of its proper divisors (95329311043).

256606655165 is a wasteful number, since it uses less digits than its factorization.

256606655165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380588.

The product of its (nonzero) digits is 9720000, while the sum is 53.

The spelling of 256606655165 in words is "two hundred fifty-six billion, six hundred six million, six hundred fifty-five thousand, one hundred sixty-five".