81888162072 has 32 divisors (see below), whose sum is σ = 204731323200. Its totient is φ = 27294598304.

The previous prime is 81888162067. The next prime is 81888162137. The reversal of 81888162072 is 27026188818.

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, 429079 + ... + 589817.

It is an arithmetic number, because the mean of its divisors is an integer number (6397853850).

Almost surely, 2^81888162072 is an apocalyptic number.

It is an amenable number.

81888162072 is an abundant number, since it is smaller than the sum of its proper divisors (122843161128).

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

81888162072 is a wasteful number, since it uses less digits than its factorization.

81888162072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181975 (or 181971 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 51.

The spelling of 81888162072 in words is "eighty-one billion, eight hundred eighty-eight million, one hundred sixty-two thousand, seventy-two".