99043568640 has 352 divisors, whose sum is σ = 356975838720. Its totient is φ = 26037043200.

The previous prime is 99043568639. The next prime is 99043568669. The reversal of 99043568640 is 4686534099.

99043568640 is a `hidden beast` number, since 9 + 90 + 435 + 6 + 86 + 40 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9809995 + ... + 9820085.

Almost surely, 2^99043568640 is an apocalyptic number.

99043568640 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 99043568640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178487919360).

99043568640 is an abundant number, since it is smaller than the sum of its proper divisors (257932270080).

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

99043568640 is a wasteful number, since it uses less digits than its factorization.

99043568640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10196 (or 10172 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 99043568640 in words is "ninety-nine billion, forty-three million, five hundred sixty-eight thousand, six hundred forty".