81018817076 has 12 divisors (see below), whose sum is σ = 141892763040. Its totient is φ = 40478027640.

The previous prime is 81018817067. The next prime is 81018817123. The reversal of 81018817076 is 67071881018.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81018817076.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7839416 + ... + 7849743.

It is an arithmetic number, because the mean of its divisors is an integer number (11824396920).

Almost surely, 2^81018817076 is an apocalyptic number.

It is an amenable number.

81018817076 is a deficient number, since it is larger than the sum of its proper divisors (60873945964).

81018817076 is a wasteful number, since it uses less digits than its factorization.

81018817076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15690454 (or 15690452 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 47.

The spelling of 81018817076 in words is "eighty-one billion, eighteen million, eight hundred seventeen thousand, seventy-six".