99909139975 has 24 divisors (see below), whose sum is σ = 124275251232. Its totient is φ = 79677312000.

The previous prime is 99909139951. The next prime is 99909140003. The reversal of 99909139975 is 57993190999.

It is not a de Polignac number, because 99909139975 - 2⁵ = 99909139943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29100859 + ... + 29104291.

It is an arithmetic number, because the mean of its divisors is an integer number (5178135468).

Almost surely, 2^99909139975 is an apocalyptic number.

99909139975 is a deficient number, since it is larger than the sum of its proper divisors (24366111257).

99909139975 is a wasteful number, since it uses less digits than its factorization.

99909139975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6747 (or 6742 counting only the distinct ones).

The product of its (nonzero) digits is 55801305, while the sum is 70.

The spelling of 99909139975 in words is "ninety-nine billion, nine hundred nine million, one hundred thirty-nine thousand, nine hundred seventy-five".