81999789373696 has 36 divisors (see below), whose sum is σ = 163753566547312. Its totient is φ = 40981283467776.

The previous prime is 81999789373549. The next prime is 81999789373739. The reversal of 81999789373696 is 69637398799918.

81999789373696 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 72135006 + ... + 73262941.

Almost surely, 2^{81999789373696} is an apocalyptic number.

It is an amenable number.

81999789373696 is a deficient number, since it is larger than the sum of its proper divisors (81753777173616).

81999789373696 is a wasteful number, since it uses less digits than its factorization.

81999789373696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145400166 (or 145400152 counting only the distinct ones).

The product of its digits is 59997563136, while the sum is 94.

The spelling of 81999789373696 in words is "eighty-one trillion, nine hundred ninety-nine billion, seven hundred eighty-nine million, three hundred seventy-three thousand, six hundred ninety-six".