99665913600 has 1296 divisors, whose sum is σ = 434139713280. Its totient is φ = 21499084800.

The previous prime is 99665913563. The next prime is 99665913653. The reversal of 99665913600 is 631956699.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 204652557 + ... + 204653043.

Almost surely, 2^99665913600 is an apocalyptic number.

99665913600 is a gapful number since it is divisible by the number (90) 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 99665913600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217069856640).

99665913600 is an abundant number, since it is smaller than the sum of its proper divisors (334473799680).

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

99665913600 is a wasteful number, since it uses less digits than its factorization.

99665913600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 2361960, while the sum is 54.

The spelling of 99665913600 in words is "ninety-nine billion, six hundred sixty-five million, nine hundred thirteen thousand, six hundred".