99365994091 has 32 divisors (see below), whose sum is σ = 123442930688. Its totient is φ = 77885193600.

The previous prime is 99365994043. The next prime is 99365994107. The reversal of 99365994091 is 19049956399.

It is a cyclic number.

It is not a de Polignac number, because 99365994091 - 2¹¹ = 99365992043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99365994001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5115700 + ... + 5135086.

It is an arithmetic number, because the mean of its divisors is an integer number (3857591584).

Almost surely, 2^99365994091 is an apocalyptic number.

99365994091 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

99365994091 is the 181995-th hex number.

99365994091 is a deficient number, since it is larger than the sum of its proper divisors (24076936597).

99365994091 is a wasteful number, since it uses less digits than its factorization.

99365994091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19931.

The product of its (nonzero) digits is 21257640, while the sum is 64.

The spelling of 99365994091 in words is "ninety-nine billion, three hundred sixty-five million, nine hundred ninety-four thousand, ninety-one".