2686181345631 has 12 divisors (see below), whose sum is σ = 4434331110352. Its totient is φ = 1534960768896.

The previous prime is 2686181345587. The next prime is 2686181345657. The reversal of 2686181345631 is 1365431816862.

It is a happy number.

2686181345631 is a `hidden beast` number, since 2 + 6 + 8 + 6 + 181 + 3 + 456 + 3 + 1 = 666.

It is not a de Polignac number, because 2686181345631 - 2³⁷ = 2548742392159 is a prime.

It is a super-2 number, since 2×2686181345631² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2686181340631) 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, 21318899506 + ... + 21318899631.

Almost surely, 2^{2686181345631} is an apocalyptic number.

2686181345631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2686181345631 is a deficient number, since it is larger than the sum of its proper divisors (1748149764721).

2686181345631 is a wasteful number, since it uses less digits than its factorization.

2686181345631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42637799150 (or 42637799147 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The spelling of 2686181345631 in words is "two trillion, six hundred eighty-six billion, one hundred eighty-one million, three hundred forty-five thousand, six hundred thirty-one".