99121185566 has 32 divisors (see below), whose sum is σ = 161174966400. Its totient is φ = 45447413760.

The previous prime is 99121185563. The next prime is 99121185589. The reversal of 99121185566 is 66558112199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99121185563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2597150 + ... + 2635038.

It is an arithmetic number, because the mean of its divisors is an integer number (5036717700).

Almost surely, 2^99121185566 is an apocalyptic number.

99121185566 is a deficient number, since it is larger than the sum of its proper divisors (62053780834).

99121185566 is a wasteful number, since it uses less digits than its factorization.

99121185566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38564.

The product of its digits is 1166400, while the sum is 53.

The spelling of 99121185566 in words is "ninety-nine billion, one hundred twenty-one million, one hundred eighty-five thousand, five hundred sixty-six".