681156296631 has 12 divisors (see below), whose sum is σ = 983907969408. Its totient is φ = 454097025024.

The previous prime is 681156296621. The next prime is 681156296659. The reversal of 681156296631 is 136692651186.

681156296631 is a `hidden beast` number, since 6 + 8 + 1 + 1 + 5 + 629 + 6 + 6 + 3 + 1 = 666.

It is not a de Polignac number, because 681156296631 - 2³⁰ = 680082554807 is a prime.

It is a super-2 number, since 2×681156296631² (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 (681156296621) 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, 39466 + ... + 1167848.

It is an arithmetic number, because the mean of its divisors is an integer number (81992330784).

Almost surely, 2^681156296631 is an apocalyptic number.

681156296631 is a deficient number, since it is larger than the sum of its proper divisors (302751672777).

681156296631 is a wasteful number, since it uses less digits than its factorization.

681156296631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195462 (or 1195459 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The spelling of 681156296631 in words is "six hundred eighty-one billion, one hundred fifty-six million, two hundred ninety-six thousand, six hundred thirty-one".