99874947666520 has 512 divisors, whose sum is σ = 266473989734400. Its totient is φ = 33355455823872.

The previous prime is 99874947666511. The next prime is 99874947666553. The reversal of 99874947666520 is 2566674947899.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4700650537 + ... + 4700671783.

It is an arithmetic number, because the mean of its divisors is an integer number (520457011200).

Almost surely, 2^{99874947666520} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99874947666520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133236994867200).

99874947666520 is an abundant number, since it is smaller than the sum of its proper divisors (166599042067880).

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

99874947666520 is a wasteful number, since it uses less digits than its factorization.

99874947666520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21547 (or 21543 counting only the distinct ones).

The product of its (nonzero) digits is 9876142080, while the sum is 82.

The spelling of 99874947666520 in words is "ninety-nine trillion, eight hundred seventy-four billion, nine hundred forty-seven million, six hundred sixty-six thousand, five hundred twenty".