99217915440 has 80 divisors (see below), whose sum is σ = 351514906368. Its totient is φ = 22678380288.

The previous prime is 99217915411. The next prime is 99217915463. The reversal of 99217915440 is 4451971299.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 29527462 + ... + 29530821.

Almost surely, 2^99217915440 is an apocalyptic number.

It is an amenable number.

99217915440 is an abundant number, since it is smaller than the sum of its proper divisors (252296990928).

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

99217915440 is a wasteful number, since it uses less digits than its factorization.

99217915440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59058306 (or 59058300 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 99217915440 in words is "ninety-nine billion, two hundred seventeen million, nine hundred fifteen thousand, four hundred forty".