999999999915 has 16 divisors (see below), whose sum is σ = 1828571428608. Its totient is φ = 457142857056.

The previous prime is 999999999899. The next prime is 999999999937. The reversal of 999999999915 is 519999999999.

It is a happy number.

It is not a de Polignac number, because 999999999915 - 2⁴ = 999999999899 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4761904657 + ... + 4761904866.

It is an arithmetic number, because the mean of its divisors is an integer number (114285714288).

Almost surely, 2^999999999915 is an apocalyptic number.

999999999915 is a deficient number, since it is larger than the sum of its proper divisors (828571428693).

999999999915 is a wasteful number, since it uses less digits than its factorization.

999999999915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9523809538.

The product of its digits is 17433922005, while the sum is 96.

The spelling of 999999999915 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifteen".