81614517912 has 24 divisors (see below), whose sum is σ = 221039319540. Its totient is φ = 27204839280.

The previous prime is 81614517889. The next prime is 81614517913. The reversal of 81614517912 is 21971541618.

81614517912 is a `hidden beast` number, since 8 + 1 + 614 + 5 + 17 + 9 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81614517913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 566767414 + ... + 566767557.

Almost surely, 2^81614517912 is an apocalyptic number.

It is an amenable number.

81614517912 is an abundant number, since it is smaller than the sum of its proper divisors (139424801628).

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

81614517912 is a wasteful number, since it uses less digits than its factorization.

81614517912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133534983 (or 1133534976 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The spelling of 81614517912 in words is "eighty-one billion, six hundred fourteen million, five hundred seventeen thousand, nine hundred twelve".