255643117657 has 8 divisors (see below), whose sum is σ = 267117081984. Its totient is φ = 244199073888.

The previous prime is 255643117637. The next prime is 255643117721. The reversal of 255643117657 is 756711346552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255643117657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255643117607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7462668 + ... + 7496845.

It is an arithmetic number, because the mean of its divisors is an integer number (33389635248).

Almost surely, 2^255643117657 is an apocalyptic number.

It is an amenable number.

255643117657 is a deficient number, since it is larger than the sum of its proper divisors (11473964327).

255643117657 is a wasteful number, since it uses less digits than its factorization.

255643117657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14960279.

The product of its digits is 5292000, while the sum is 52.

The spelling of 255643117657 in words is "two hundred fifty-five billion, six hundred forty-three million, one hundred seventeen thousand, six hundred fifty-seven".