257823231690 has 64 divisors (see below), whose sum is σ = 622162985472. Its totient is φ = 68377320000.

The previous prime is 257823231683. The next prime is 257823231703. The reversal of 257823231690 is 96132328752.

It is a super-2 number, since 2×257823231690² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5117925 + ... + 5168055.

It is an arithmetic number, because the mean of its divisors is an integer number (9721296648).

Almost surely, 2^257823231690 is an apocalyptic number.

257823231690 is an abundant number, since it is smaller than the sum of its proper divisors (364339753782).

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

257823231690 is a wasteful number, since it uses less digits than its factorization.

257823231690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51075.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 257823231690 in words is "two hundred fifty-seven billion, eight hundred twenty-three million, two hundred thirty-one thousand, six hundred ninety".