99689990655 has 16 divisors (see below), whose sum is σ = 159508128384. Its totient is φ = 53166613920.

The previous prime is 99689990641. The next prime is 99689990663. The reversal of 99689990655 is 55609998699.

It is not a de Polignac number, because 99689990655 - 2⁴ = 99689990639 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811860 + ... + 926550.

It is an arithmetic number, because the mean of its divisors is an integer number (9969258024).

Almost surely, 2^99689990655 is an apocalyptic number.

99689990655 is a deficient number, since it is larger than the sum of its proper divisors (59818137729).

99689990655 is a wasteful number, since it uses less digits than its factorization.

99689990655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172646.

The product of its (nonzero) digits is 425152800, while the sum is 75.

The spelling of 99689990655 in words is "ninety-nine billion, six hundred eighty-nine million, nine hundred ninety thousand, six hundred fifty-five".