257409886660 has 24 divisors (see below), whose sum is σ = 543685397976. Its totient is φ = 102368785920.

The previous prime is 257409886633. The next prime is 257409886703. The reversal of 257409886660 is 66688904752.

It can be written as a sum of positive squares in 4 ways, for example, as 14319472896 + 243090413764 = 119664^2 + 493042^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37194501 + ... + 37201420.

It is an arithmetic number, because the mean of its divisors is an integer number (22653558249).

Almost surely, 2^257409886660 is an apocalyptic number.

257409886660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257409886660 is an abundant number, since it is smaller than the sum of its proper divisors (286275511316).

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

257409886660 is a wasteful number, since it uses less digits than its factorization.

257409886660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74396103 (or 74396101 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 61.

The spelling of 257409886660 in words is "two hundred fifty-seven billion, four hundred nine million, eight hundred eighty-six thousand, six hundred sixty".