81015851496 has 64 divisors (see below), whose sum is σ = 218961806400. Its totient is φ = 24892489728.

The previous prime is 81015851489. The next prime is 81015851507. The reversal of 81015851496 is 69415851018.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2384025 + ... + 2417768.

It is an arithmetic number, because the mean of its divisors is an integer number (3421278225).

Almost surely, 2^81015851496 is an apocalyptic number.

It is an amenable number.

81015851496 is an abundant number, since it is smaller than the sum of its proper divisors (137945954904).

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

81015851496 is a wasteful number, since it uses less digits than its factorization.

81015851496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4801858 (or 4801854 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 48.

The spelling of 81015851496 in words is "eighty-one billion, fifteen million, eight hundred fifty-one thousand, four hundred ninety-six".