99966399912 has 128 divisors (see below), whose sum is σ = 279809712000. Its totient is φ = 33067906560.

The previous prime is 99966399857. The next prime is 99966399943. The reversal of 99966399912 is 21999366999.

99966399912 is a `hidden beast` number, since 9 + 99 + 66 + 399 + 91 + 2 = 666.

It is a super-2 number, since 2×99966399912² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20444764 + ... + 20449652.

It is an arithmetic number, because the mean of its divisors is an integer number (2186013375).

Almost surely, 2^99966399912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99966399912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139904856000).

99966399912 is an abundant number, since it is smaller than the sum of its proper divisors (179843312088).

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

99966399912 is a wasteful number, since it uses less digits than its factorization.

99966399912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5608 (or 5598 counting only the distinct ones).

The product of its digits is 114791256, while the sum is 72.

The spelling of 99966399912 in words is "ninety-nine billion, nine hundred sixty-six million, three hundred ninety-nine thousand, nine hundred twelve".