257872862691 has 96 divisors (see below), whose sum is σ = 418856106240. Its totient is φ = 152098910208.

The previous prime is 257872862641. The next prime is 257872862743. The reversal of 257872862691 is 196268278752.

257872862691 is a `hidden beast` number, since 25 + 78 + 7 + 286 + 269 + 1 = 666.

It is not a de Polignac number, because 257872862691 - 2⁶ = 257872862627 is a prime.

It is a super-2 number, since 2×257872862691² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257872862641) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 41079045 + ... + 41085321.

It is an arithmetic number, because the mean of its divisors is an integer number (4363084440).

Almost surely, 2^257872862691 is an apocalyptic number.

257872862691 is a deficient number, since it is larger than the sum of its proper divisors (160983243549).

257872862691 is a wasteful number, since it uses less digits than its factorization.

257872862691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6573 (or 6570 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The spelling of 257872862691 in words is "two hundred fifty-seven billion, eight hundred seventy-two million, eight hundred sixty-two thousand, six hundred ninety-one".