99451227481920 has 336 divisors, whose sum is σ = 353234646336000. Its totient is φ = 25655433523200.

The previous prime is 99451227481901. The next prime is 99451227481937. The reversal of 99451227481920 is 2918472215499.

99451227481920 is a `hidden beast` number, since 9 + 9 + 4 + 5 + 122 + 7 + 481 + 9 + 20 = 666.

It is a congruent number.

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, 245228115 + ... + 245633325.

Almost surely, 2^{99451227481920} is an apocalyptic number.

99451227481920 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 99451227481920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176617323168000).

99451227481920 is an abundant number, since it is smaller than the sum of its proper divisors (253783418854080).

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

99451227481920 is a wasteful number, since it uses less digits than its factorization.

99451227481920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408014 (or 408001 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 99451227481920 in words is "ninety-nine trillion, four hundred fifty-one billion, two hundred twenty-seven million, four hundred eighty-one thousand, nine hundred twenty".