99661312275 has 192 divisors, whose sum is σ = 206386790400. Its totient is φ = 41403640320.

The previous prime is 99661312253. The next prime is 99661312277. The reversal of 99661312275 is 57221316699.

It is not a de Polignac number, because 99661312275 - 2⁵ = 99661312243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99661312277) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 48307894 + ... + 48309956.

It is an arithmetic number, because the mean of its divisors is an integer number (1074931200).

Almost surely, 2^99661312275 is an apocalyptic number.

99661312275 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

99661312275 is an abundant number, since it is smaller than the sum of its proper divisors (106725478125).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99661312275 is a wasteful number, since it uses less digits than its factorization.

99661312275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298 (or 2293 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 51.

The spelling of 99661312275 in words is "ninety-nine billion, six hundred sixty-one million, three hundred twelve thousand, two hundred seventy-five".