626834931381 has 24 divisors (see below), whose sum is σ = 922765254840. Its totient is φ = 409892585856.

The previous prime is 626834931353. The next prime is 626834931427. The reversal of 626834931381 is 183139438626.

626834931381 is a `hidden beast` number, since 6 + 2 + 68 + 3 + 493 + 13 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 422033428881 + 204801502500 = 649641^2 + 452550^2 .

It is not a de Polignac number, because 626834931381 - 2²⁶ = 626767822517 is a prime.

It is a super-2 number, since 2×626834931381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (626834931311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1575235 + ... + 1932623.

It is an arithmetic number, because the mean of its divisors is an integer number (38448552285).

Almost surely, 2^626834931381 is an apocalyptic number.

It is an amenable number.

626834931381 is a deficient number, since it is larger than the sum of its proper divisors (295930323459).

626834931381 is a wasteful number, since it uses less digits than its factorization.

626834931381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361125 (or 361122 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The spelling of 626834931381 in words is "six hundred twenty-six billion, eight hundred thirty-four million, nine hundred thirty-one thousand, three hundred eighty-one".