257749976863 has 2 divisors, whose sum is σ = 257749976864. Its totient is φ = 257749976862.

The previous prime is 257749976843. The next prime is 257749976963. The reversal of 257749976863 is 368679947752.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257749976863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257749976843) 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 as a sum of consecutive naturals, namely, 128874988431 + 128874988432.

It is an arithmetic number, because the mean of its divisors is an integer number (128874988432).

Almost surely, 2^257749976863 is an apocalyptic number.

257749976863 is a deficient number, since it is larger than the sum of its proper divisors (1).

257749976863 is an equidigital number, since it uses as much as digits as its factorization.

257749976863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960180480, while the sum is 73.

The spelling of 257749976863 in words is "two hundred fifty-seven billion, seven hundred forty-nine million, nine hundred seventy-six thousand, eight hundred sixty-three".