99815519232 has 1056 divisors, whose sum is σ = 366950787840. Its totient is φ = 25692733440.

The previous prime is 99815519231. The next prime is 99815519351. The reversal of 99815519232 is 23291551899.

It is a happy number.

99815519232 is a `hidden beast` number, since 9 + 9 + 81 + 551 + 9 + 2 + 3 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (1056).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99815519231) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1121522644 + ... + 1121522732.

Almost surely, 2^99815519232 is an apocalyptic number.

99815519232 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99815519232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183475393920).

99815519232 is an abundant number, since it is smaller than the sum of its proper divisors (267135268608).

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

99815519232 is a wasteful number, since it uses less digits than its factorization.

99815519232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 178 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 54.

The spelling of 99815519232 in words is "ninety-nine billion, eight hundred fifteen million, five hundred nineteen thousand, two hundred thirty-two".