81411982904 has 32 divisors (see below), whose sum is σ = 178511329920. Its totient is φ = 34079433696.

The previous prime is 81411982889. The next prime is 81411982979. The reversal of 81411982904 is 40928911418.

It is a happy number.

It is a super-2 number, since 2×81411982904² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16902074 + ... + 16906889.

It is an arithmetic number, because the mean of its divisors is an integer number (5578479060).

Almost surely, 2^81411982904 is an apocalyptic number.

It is an amenable number.

81411982904 is an abundant number, since it is smaller than the sum of its proper divisors (97099347016).

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

81411982904 is a wasteful number, since it uses less digits than its factorization.

81411982904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33809019 (or 33809015 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 47.

The spelling of 81411982904 in words is "eighty-one billion, four hundred eleven million, nine hundred eighty-two thousand, nine hundred four".