257134968561 has 8 divisors (see below), whose sum is σ = 343371660480. Its totient is φ = 171160794512.

The previous prime is 257134968553. The next prime is 257134968583. The reversal of 257134968561 is 165869431752.

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 257134968561 - 2³ = 257134968553 is a prime.

It is a super-2 number, since 2×257134968561² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257134968521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65627181 + ... + 65631098.

It is an arithmetic number, because the mean of its divisors is an integer number (42921457560).

Almost surely, 2^257134968561 is an apocalyptic number.

It is an amenable number.

257134968561 is a deficient number, since it is larger than the sum of its proper divisors (86236691919).

257134968561 is a wasteful number, since it uses less digits than its factorization.

257134968561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131258935.

The product of its digits is 10886400, while the sum is 57.

The spelling of 257134968561 in words is "two hundred fifty-seven billion, one hundred thirty-four million, nine hundred sixty-eight thousand, five hundred sixty-one".