81388692196 has 12 divisors (see below), whose sum is σ = 162777384448. Its totient is φ = 34880868072.

The previous prime is 81388692157. The next prime is 81388692211. The reversal of 81388692196 is 69129688318.

81388692196 is an admirable 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, 1453369476 + ... + 1453369531.

Almost surely, 2^81388692196 is an apocalyptic number.

It is an amenable number.

81388692196 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81388692196 is a wasteful number, since it uses less digits than its factorization.

81388692196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906739018 (or 2906739016 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 61.

The spelling of 81388692196 in words is "eighty-one billion, three hundred eighty-eight million, six hundred ninety-two thousand, one hundred ninety-six".