257116566 has 32 divisors (see below), whose sum is σ = 588752640. Its totient is φ = 73329696.

The previous prime is 257116549. The next prime is 257116603. The reversal of 257116566 is 665611752.

It is a super-2 number, since 2×257116566² = 132217857023264712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19440 + ... + 29868.

It is an arithmetic number, because the mean of its divisors is an integer number (18398520).

Almost surely, 2^257116566 is an apocalyptic number.

257116566 is an abundant number, since it is smaller than the sum of its proper divisors (331636074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257116566 is a wasteful number, since it uses less digits than its factorization.

257116566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11028.

The product of its digits is 75600, while the sum is 39.

The square root of 257116566 is about 16034.8547233831. The cubic root of 257116566 is about 635.8822267189.

The spelling of 257116566 in words is "two hundred fifty-seven million, one hundred sixteen thousand, five hundred sixty-six".