99999881100 has 432 divisors, whose sum is σ = 377333661600. Its totient is φ = 22651453440.

The previous prime is 99999881071. The next prime is 99999881129. The reversal of 99999881100 is 118899999.

It is an interprime number because it is at equal distance from previous prime (99999881071) and next prime (99999881129).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 14946556 + ... + 14953244.

It is an arithmetic number, because the mean of its divisors is an integer number (873457550).

Almost surely, 2^99999881100 is an apocalyptic number.

99999881100 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 99999881100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188666830800).

99999881100 is an abundant number, since it is smaller than the sum of its proper divisors (277333780500).

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

99999881100 is a wasteful number, since it uses less digits than its factorization.

99999881100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6839 (or 6819 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 63.

The spelling of 99999881100 in words is "ninety-nine billion, nine hundred ninety-nine million, eight hundred eighty-one thousand, one hundred".