257640667020835 has 16 divisors (see below), whose sum is σ = 353358822801600. Its totient is φ = 176656360513536.

The previous prime is 257640667020817. The next prime is 257640667020881. The reversal of 257640667020835 is 538020766046752.

It is a cyclic number.

It is not a de Polignac number, because 257640667020835 - 2⁹ = 257640667020323 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239569230 + ... + 240642259.

It is an arithmetic number, because the mean of its divisors is an integer number (22084926425100).

Almost surely, 2^{257640667020835} is an apocalyptic number.

257640667020835 is a deficient number, since it is larger than the sum of its proper divisors (95718155780765).

257640667020835 is a wasteful number, since it uses less digits than its factorization.

257640667020835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480226830.

The product of its (nonzero) digits is 101606400, while the sum is 61.

The spelling of 257640667020835 in words is "two hundred fifty-seven trillion, six hundred forty billion, six hundred sixty-seven million, twenty thousand, eight hundred thirty-five".