99161880720 has 320 divisors, whose sum is σ = 357550448640. Its totient is φ = 22266316800.

The previous prime is 99161880637. The next prime is 99161880749. The reversal of 99161880720 is 2708816199.

99161880720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28002150 + ... + 28005690.

It is an arithmetic number, because the mean of its divisors is an integer number (1117345152).

Almost surely, 2^99161880720 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 99161880720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178775224320).

99161880720 is an abundant number, since it is smaller than the sum of its proper divisors (258388567920).

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

99161880720 is a wasteful number, since it uses less digits than its factorization.

99161880720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3854 (or 3848 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 51.

The spelling of 99161880720 in words is "ninety-nine billion, one hundred sixty-one million, eight hundred eighty thousand, seven hundred twenty".