99911861800 has 24 divisors (see below), whose sum is σ = 232295079150. Its totient is φ = 39964744640.

The previous prime is 99911861789. The next prime is 99911861801. The reversal of 99911861800 is 816811999.

It can be written as a sum of positive squares in 3 ways, for example, as 60662704804 + 39249156996 = 246298^2 + 198114^2 .

It is not an unprimeable number, because it can be changed into a prime (99911861801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 249779455 + ... + 249779854.

Almost surely, 2^99911861800 is an apocalyptic number.

It is an amenable number.

99911861800 is an abundant number, since it is smaller than the sum of its proper divisors (132383217350).

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

99911861800 is a wasteful number, since it uses less digits than its factorization.

99911861800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499559325 (or 499559316 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 52.

The spelling of 99911861800 in words is "ninety-nine billion, nine hundred eleven million, eight hundred sixty-one thousand, eight hundred".