257731663 has 8 divisors (see below), whose sum is σ = 294681728. Its totient is φ = 220814424.

The previous prime is 257731651. The next prime is 257731681. The reversal of 257731663 is 366137752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257731663 - 2²⁵ = 224177231 is a prime.

It is a super-2 number, since 2×257731663² = 132851220225491138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257731693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11920 + ... + 25642.

It is an arithmetic number, because the mean of its divisors is an integer number (36835216).

Almost surely, 2^257731663 is an apocalyptic number.

257731663 is a deficient number, since it is larger than the sum of its proper divisors (36950065).

257731663 is a wasteful number, since it uses less digits than its factorization.

257731663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16413.

The product of its digits is 158760, while the sum is 40.

The square root of 257731663 is about 16054.0232652130. The cubic root of 257731663 is about 636.3888941447.

The spelling of 257731663 in words is "two hundred fifty-seven million, seven hundred thirty-one thousand, six hundred sixty-three".