99897279897 has 16 divisors (see below), whose sum is σ = 135074665088. Its totient is φ = 65659766400.

The previous prime is 99897279863. The next prime is 99897279917. The reversal of 99897279897 is 79897279899.

It is not a de Polignac number, because 99897279897 - 2²⁰ = 99896231321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99897272897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 469263 + ... + 648075.

It is an arithmetic number, because the mean of its divisors is an integer number (8442166568).

Almost surely, 2^99897279897 is an apocalyptic number.

It is an amenable number.

99897279897 is a deficient number, since it is larger than the sum of its proper divisors (35177385191).

99897279897 is a wasteful number, since it uses less digits than its factorization.

99897279897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181440.

The product of its digits is 2592487296, while the sum is 84.

The spelling of 99897279897 in words is "ninety-nine billion, eight hundred ninety-seven million, two hundred seventy-nine thousand, eight hundred ninety-seven".