99539686564 has 6 divisors (see below), whose sum is σ = 174194451494. Its totient is φ = 49769843280.

The previous prime is 99539686513. The next prime is 99539686579. The reversal of 99539686564 is 46568693599.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 49992488100 + 49547198464 = 223590^2 + 222592^2 .

It is a junction number, because it is equal to n+sod(n) for n = 99539686493 and 99539686502.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12442460817 + ... + 12442460824.

Almost surely, 2^99539686564 is an apocalyptic number.

It is an amenable number.

99539686564 is a deficient number, since it is larger than the sum of its proper divisors (74654764930).

99539686564 is a wasteful number, since it uses less digits than its factorization.

99539686564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24884921645 (or 24884921643 counting only the distinct ones).

The product of its digits is 377913600, while the sum is 70.

The spelling of 99539686564 in words is "ninety-nine billion, five hundred thirty-nine million, six hundred eighty-six thousand, five hundred sixty-four".