256717169093 has 16 divisors (see below), whose sum is σ = 330387578880. Its totient is φ = 193586468400.

The previous prime is 256717169087. The next prime is 256717169147. The reversal of 256717169093 is 390961717652.

It is a cyclic number.

It is not a de Polignac number, because 256717169093 - 2⁸ = 256717168837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256717169083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53771633 + ... + 53776406.

It is an arithmetic number, because the mean of its divisors is an integer number (20649223680).

Almost surely, 2^256717169093 is an apocalyptic number.

It is an amenable number.

256717169093 is a deficient number, since it is larger than the sum of its proper divisors (73670409787).

256717169093 is a wasteful number, since it uses less digits than its factorization.

256717169093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107548088.

The product of its (nonzero) digits is 4286520, while the sum is 56.

The spelling of 256717169093 in words is "two hundred fifty-six billion, seven hundred seventeen million, one hundred sixty-nine thousand, ninety-three".