256057672865 has 16 divisors (see below), whose sum is σ = 318366494928. Its totient is φ = 197545936896.

The previous prime is 256057672853. The next prime is 256057672889. The reversal of 256057672865 is 568276750652.

It can be written as a sum of positive squares in 8 ways, for example, as 467770384 + 255589902481 = 21628^2 + 505559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256057672865 is a prime.

It is a Duffinian 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, 6103412 + ... + 6145221.

It is an arithmetic number, because the mean of its divisors is an integer number (19897905933).

Almost surely, 2^256057672865 is an apocalyptic number.

It is an amenable number.

256057672865 is a deficient number, since it is larger than the sum of its proper divisors (62308822063).

256057672865 is a wasteful number, since it uses less digits than its factorization.

256057672865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12248788.

The product of its (nonzero) digits is 42336000, while the sum is 59.

The spelling of 256057672865 in words is "two hundred fifty-six billion, fifty-seven million, six hundred seventy-two thousand, eight hundred sixty-five".