12631999581918 has 24 divisors (see below), whose sum is σ = 27440792840448. Its totient is φ = 4199672617632.

The previous prime is 12631999581893. The next prime is 12631999581923. The reversal of 12631999581918 is 81918599913621.

12631999581918 is a `hidden beast` number, since 1 + 2 + 6 + 31 + 9 + 9 + 9 + 581 + 9 + 1 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 916152055 + ... + 916165842.

It is an arithmetic number, because the mean of its divisors is an integer number (1143366368352).

Almost surely, 2^{12631999581918} is an apocalyptic number.

12631999581918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12631999581918 is an abundant number, since it is smaller than the sum of its proper divisors (14808793258530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12631999581918 is a wasteful number, since it uses less digits than its factorization.

12631999581918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832318288 (or 1832318285 counting only the distinct ones).

The product of its digits is 75582720, while the sum is 72.

The spelling of 12631999581918 in words is "twelve trillion, six hundred thirty-one billion, nine hundred ninety-nine million, five hundred eighty-one thousand, nine hundred eighteen".