99491166720 has 480 divisors, whose sum is σ = 377151128640. Its totient is φ = 24038277120.

The previous prime is 99491166683. The next prime is 99491166767. The reversal of 99491166720 is 2766119499.

It is a happy number.

99491166720 is a `hidden beast` number, since 99 + 491 + 1 + 6 + 67 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 115821651 + ... + 115822509.

It is an arithmetic number, because the mean of its divisors is an integer number (785731518).

Almost surely, 2^99491166720 is an apocalyptic number.

99491166720 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 99491166720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188575564320).

99491166720 is an abundant number, since it is smaller than the sum of its proper divisors (277659961920).

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

99491166720 is a wasteful number, since it uses less digits than its factorization.

99491166720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356 (or 1337 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The spelling of 99491166720 in words is "ninety-nine billion, four hundred ninety-one million, one hundred sixty-six thousand, seven hundred twenty".