81199223016 has 32 divisors (see below), whose sum is σ = 203005038240. Its totient is φ = 27065476928.

The previous prime is 81199222999. The next prime is 81199223033. The reversal of 81199223016 is 61032299118.

It is an interprime number because it is at equal distance from previous prime (81199222999) and next prime (81199223033).

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, 1346830 + ... + 1405826.

It is an arithmetic number, because the mean of its divisors is an integer number (6343907445).

Almost surely, 2^81199223016 is an apocalyptic number.

It is an amenable number.

81199223016 is an abundant number, since it is smaller than the sum of its proper divisors (121805815224).

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

81199223016 is a wasteful number, since it uses less digits than its factorization.

81199223016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116353 (or 116349 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The spelling of 81199223016 in words is "eighty-one billion, one hundred ninety-nine million, two hundred twenty-three thousand, sixteen".