99644912640 has 1056 divisors, whose sum is σ = 440792136960. Its totient is φ = 20787757056.

The previous prime is 99644912519. The next prime is 99644912737. The reversal of 99644912640 is 4621944699.

It is a happy number.

99644912640 is a `hidden beast` number, since 9 + 96 + 4 + 491 + 2 + 64 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1119605716 + ... + 1119605804.

Almost surely, 2^99644912640 is an apocalyptic number.

99644912640 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 99644912640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220396068480).

99644912640 is an abundant number, since it is smaller than the sum of its proper divisors (341147224320).

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

99644912640 is a wasteful number, since it uses less digits than its factorization.

99644912640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 99644912640 in words is "ninety-nine billion, six hundred forty-four million, nine hundred twelve thousand, six hundred forty".