99637488721 has 8 divisors (see below), whose sum is σ = 104364881280. Its totient is φ = 94943040192.

The previous prime is 99637488697. The next prime is 99637488779. The reversal of 99637488721 is 12788473699.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99637488721 - 2²³ = 99629100113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99637488521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8229816 + ... + 8241913.

It is an arithmetic number, because the mean of its divisors is an integer number (13045610160).

Almost surely, 2^99637488721 is an apocalyptic number.

It is an amenable number.

99637488721 is a deficient number, since it is larger than the sum of its proper divisors (4727392559).

99637488721 is a wasteful number, since it uses less digits than its factorization.

99637488721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16472015.

The product of its digits is 36578304, while the sum is 64.

The spelling of 99637488721 in words is "ninety-nine billion, six hundred thirty-seven million, four hundred eighty-eight thousand, seven hundred twenty-one".