81688960176 has 40 divisors (see below), whose sum is σ = 212897348400. Its totient is φ = 26988681216.

The previous prime is 81688960163. The next prime is 81688960187. The reversal of 81688960176 is 67106988618.

It is a super-2 number, since 2×81688960176² (a number of 23 digits) contains 22 as substring.

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, 7524901 + ... + 7535748.

It is an arithmetic number, because the mean of its divisors is an integer number (5322433710).

Almost surely, 2^81688960176 is an apocalyptic number.

It is an amenable number.

81688960176 is an abundant number, since it is smaller than the sum of its proper divisors (131208388224).

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

81688960176 is a wasteful number, since it uses less digits than its factorization.

81688960176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15060773 (or 15060767 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 60.

The spelling of 81688960176 in words is "eighty-one billion, six hundred eighty-eight million, nine hundred sixty thousand, one hundred seventy-six".