613681831881 has 12 divisors (see below), whose sum is σ = 886700351680. Its totient is φ = 408996126360.

The previous prime is 613681831859. The next prime is 613681831897. The reversal of 613681831881 is 188138186316.

613681831881 is a `hidden beast` number, since 613 + 6 + 8 + 1 + 8 + 3 + 18 + 8 + 1 = 666.

It is not a de Polignac number, because 613681831881 - 2⁵ = 613681831849 is a prime.

It is a super-2 number, since 2×613681831881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613681831781) 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, 10393501 + ... + 10452378.

Almost surely, 2^613681831881 is an apocalyptic number.

It is an amenable number.

613681831881 is a deficient number, since it is larger than the sum of its proper divisors (273018519799).

613681831881 is a wasteful number, since it uses less digits than its factorization.

613681831881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20849156 (or 20849153 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The spelling of 613681831881 in words is "six hundred thirteen billion, six hundred eighty-one million, eight hundred thirty-one thousand, eight hundred eighty-one".