257864023 has 2 divisors, whose sum is σ = 257864024. Its totient is φ = 257864022.

The previous prime is 257864021. The next prime is 257864053. The reversal of 257864023 is 320468752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257864023 - 2¹ = 257864021 is a prime.

Together with 257864021, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257864021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128932011 + 128932012.

It is an arithmetic number, because the mean of its divisors is an integer number (128932012).

Almost surely, 2^257864023 is an apocalyptic number.

257864023 is a deficient number, since it is larger than the sum of its proper divisors (1).

257864023 is an equidigital number, since it uses as much as digits as its factorization.

257864023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 257864023 is about 16058.1450672237. The cubic root of 257864023 is about 636.4978162406.

The spelling of 257864023 in words is "two hundred fifty-seven million, eight hundred sixty-four thousand, twenty-three".