257555057 has 2 divisors, whose sum is σ = 257555058. Its totient is φ = 257555056.

The previous prime is 257555033. The next prime is 257555063. The reversal of 257555057 is 750555752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131239936 + 126315121 = 11456^2 + 11239^2 .

It is a cyclic number.

It is not a de Polignac number, because 257555057 - 2¹² = 257550961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (257555027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128777528 + 128777529.

It is an arithmetic number, because the mean of its divisors is an integer number (128777529).

Almost surely, 2^257555057 is an apocalyptic number.

It is an amenable number.

257555057 is a deficient number, since it is larger than the sum of its proper divisors (1).

257555057 is an equidigital number, since it uses as much as digits as its factorization.

257555057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 306250, while the sum is 41.

The square root of 257555057 is about 16048.5219568657. The cubic root of 257555057 is about 636.2435029051.

The spelling of 257555057 in words is "two hundred fifty-seven million, five hundred fifty-five thousand, fifty-seven".