257797496491 has 6 divisors (see below), whose sum is σ = 271368115460. Its totient is φ = 244227110508.

The previous prime is 257797496477. The next prime is 257797496501. The reversal of 257797496491 is 194694797752.

It is not a de Polignac number, because 257797496491 - 2¹⁵ = 257797463723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257797496491.

It is not an unprimeable number, because it can be changed into a prime (257797496291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2154936 + ... + 2271418.

Almost surely, 2^257797496491 is an apocalyptic number.

257797496491 is a deficient number, since it is larger than the sum of its proper divisors (13570618969).

257797496491 is an frugal number, since it uses more digits than its factorization.

257797496491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232985 (or 116502 counting only the distinct ones).

The product of its digits is 240045120, while the sum is 70.

The spelling of 257797496491 in words is "two hundred fifty-seven billion, seven hundred ninety-seven million, four hundred ninety-six thousand, four hundred ninety-one".