256506869565 has 12 divisors (see below), whose sum is σ = 444611907324. Its totient is φ = 136803663744.

The previous prime is 256506869539. The next prime is 256506869573. The reversal of 256506869565 is 565968605652.

256506869565 is a `hidden beast` number, since 2 + 5 + 6 + 5 + 0 + 6 + 8 + 69 + 565 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27191350404 + 229315519161 = 164898^2 + 478869^2 .

It is not a de Polignac number, because 256506869565 - 2³² = 252211902269 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2850076284 + ... + 2850076373.

It is an arithmetic number, because the mean of its divisors is an integer number (37050992277).

Almost surely, 2^256506869565 is an apocalyptic number.

It is an amenable number.

256506869565 is a deficient number, since it is larger than the sum of its proper divisors (188105037759).

256506869565 is a wasteful number, since it uses less digits than its factorization.

256506869565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5700152668 (or 5700152665 counting only the distinct ones).

The product of its (nonzero) digits is 116640000, while the sum is 63.

The spelling of 256506869565 in words is "two hundred fifty-six billion, five hundred six million, eight hundred sixty-nine thousand, five hundred sixty-five".