99999915511 has 4 divisors (see below), whose sum is σ = 100032845752. Its totient is φ = 99966985272.

The previous prime is 99999915487. The next prime is 99999915523. The reversal of 99999915511 is 11551999999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11551999999 = 29761 ⋅388159.

It is a cyclic number.

It is not a de Polignac number, because 99999915511 - 2⁵ = 99999915479 is a prime.

It is a super-2 number, since 2×99999915511² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999915311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16460565 + ... + 16466638.

It is an arithmetic number, because the mean of its divisors is an integer number (25008211438).

Almost surely, 2^99999915511 is an apocalyptic number.

99999915511 is a deficient number, since it is larger than the sum of its proper divisors (32930241).

99999915511 is a wasteful number, since it uses less digits than its factorization.

99999915511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32930240.

The product of its digits is 13286025, while the sum is 67.

The spelling of 99999915511 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred fifteen thousand, five hundred eleven".