257311667 has 2 divisors, whose sum is σ = 257311668. Its totient is φ = 257311666.

The previous prime is 257311651. The next prime is 257311673. The reversal of 257311667 is 766113752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257311667 - 2⁴ = 257311651 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257311667.

It is not a weakly prime, because it can be changed into another prime (257311697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128655833 + 128655834.

It is an arithmetic number, because the mean of its divisors is an integer number (128655834).

Almost surely, 2^257311667 is an apocalyptic number.

257311667 is a deficient number, since it is larger than the sum of its proper divisors (1).

257311667 is an equidigital number, since it uses as much as digits as its factorization.

257311667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 257311667 is about 16040.9372232423. The cubic root of 257311667 is about 636.0430226490.

The spelling of 257311667 in words is "two hundred fifty-seven million, three hundred eleven thousand, six hundred sixty-seven".