257996699731 has 2 divisors, whose sum is σ = 257996699732. Its totient is φ = 257996699730.

The previous prime is 257996699729. The next prime is 257996699773. The reversal of 257996699731 is 137996699752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257996699731 - 2¹ = 257996699729 is a prime.

It is a super-3 number, since 3×257996699731³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 257996699729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (257996999731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128998349865 + 128998349866.

It is an arithmetic number, because the mean of its divisors is an integer number (128998349866).

Almost surely, 2^257996699731 is an apocalyptic number.

257996699731 is a deficient number, since it is larger than the sum of its proper divisors (1).

257996699731 is an equidigital number, since it uses as much as digits as its factorization.

257996699731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 347208120, while the sum is 73.

The spelling of 257996699731 in words is "two hundred fifty-seven billion, nine hundred ninety-six million, six hundred ninety-nine thousand, seven hundred thirty-one".