99635553801 has 27 divisors (see below), whose sum is σ = 167425980813. Its totient is φ = 56930814360.

The previous prime is 99635553769. The next prime is 99635553821. The reversal of 99635553801 is 10835553699.

It is a happy number.

The square root of 99635553801 is 315651.

It is a perfect power (a square), and thus also a powerful number.

99635553801 is a `hidden beast` number, since 9 + 9 + 6 + 3 + 5 + 553 + 80 + 1 = 666.

It is not a de Polignac number, because 99635553801 - 2⁵ = 99635553769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99635553821) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6621156 + ... + 6636186.

Almost surely, 2^99635553801 is an apocalyptic number.

99635553801 is the 315651-st square number.

99635553801 is the 157826-th centered octagonal number.

It is an amenable number.

99635553801 is a deficient number, since it is larger than the sum of its proper divisors (67790427012).

99635553801 is an frugal number, since it uses more digits than its factorization.

99635553801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30082 (or 15041 counting only the distinct ones).

The product of its (nonzero) digits is 4374000, while the sum is 54.

The spelling of 99635553801 in words is "ninety-nine billion, six hundred thirty-five million, five hundred fifty-three thousand, eight hundred one".