257725711 has 2 divisors, whose sum is σ = 257725712. Its totient is φ = 257725710.

The previous prime is 257725687. The next prime is 257725759. The reversal of 257725711 is 117527752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257725711 - 2²³ = 249337103 is a prime.

It is a super-2 number, since 2×257725711² = 132845084220911042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257725211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128862855 + 128862856.

It is an arithmetic number, because the mean of its divisors is an integer number (128862856).

Almost surely, 2^257725711 is an apocalyptic number.

257725711 is a deficient number, since it is larger than the sum of its proper divisors (1).

257725711 is an equidigital number, since it uses as much as digits as its factorization.

257725711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34300, while the sum is 37.

The square root of 257725711 is about 16053.8378900498. The cubic root of 257725711 is about 636.3839952305.

The spelling of 257725711 in words is "two hundred fifty-seven million, seven hundred twenty-five thousand, seven hundred eleven".