99509011811 has 16 divisors (see below), whose sum is σ = 114952750560. Its totient is φ = 85132615680.

The previous prime is 99509011807. The next prime is 99509011817. The reversal of 99509011811 is 11811090599.

It is a cyclic number.

It is not a de Polignac number, because 99509011811 - 2² = 99509011807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99509011817) 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, 2329235 + ... + 2371571.

It is an arithmetic number, because the mean of its divisors is an integer number (7184546910).

Almost surely, 2^99509011811 is an apocalyptic number.

99509011811 is a deficient number, since it is larger than the sum of its proper divisors (15443738749).

99509011811 is a wasteful number, since it uses less digits than its factorization.

99509011811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54934.

The product of its (nonzero) digits is 29160, while the sum is 44.

The spelling of 99509011811 in words is "ninety-nine billion, five hundred nine million, eleven thousand, eight hundred eleven".