99881218899 has 144 divisors (see below), whose sum is σ = 186433228800. Its totient is φ = 50414601600.

The previous prime is 99881218897. The next prime is 99881218907.

99881218899 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99881218899 - 2¹ = 99881218897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99881218897) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 53382934 + ... + 53384804.

It is an arithmetic number, because the mean of its divisors is an integer number (1294675200).

Almost surely, 2^99881218899 is an apocalyptic number.

99881218899 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

99881218899 is a deficient number, since it is larger than the sum of its proper divisors (86552009901).

99881218899 is a wasteful number, since it uses less digits than its factorization.

99881218899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102 (or 2088 counting only the distinct ones).

The product of its digits is 53747712, while the sum is 72.

The spelling of 99881218899 in words is "ninety-nine billion, eight hundred eighty-one million, two hundred eighteen thousand, eight hundred ninety-nine".