257045064840 has 48 divisors (see below), whose sum is σ = 835396461900. Its totient is φ = 68545350528.

The previous prime is 257045064833. The next prime is 257045064841. The reversal of 257045064840 is 48460540752.

It can be written as a sum of positive squares in 2 ways, for example, as 242176188996 + 14868875844 = 492114^2 + 121938^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (257045064841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 357006675 + ... + 357007394.

Almost surely, 2^257045064840 is an apocalyptic number.

257045064840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257045064840 is an abundant number, since it is smaller than the sum of its proper divisors (578351397060).

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

257045064840 is a wasteful number, since it uses less digits than its factorization.

257045064840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714014086 (or 714014079 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 45.

The spelling of 257045064840 in words is "two hundred fifty-seven billion, forty-five million, sixty-four thousand, eight hundred forty".