99812937796991 has 12 divisors (see below), whose sum is σ = 101758079765160. Its totient is φ = 97901737784640.

The previous prime is 99812937796937. The next prime is 99812937796997. The reversal of 99812937796991 is 19969773921899.

It is not a de Polignac number, because 99812937796991 - 2²⁶ = 99812870688127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99812937796897 and 99812937796906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99812937796997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50776181 + ... + 52705278.

It is an arithmetic number, because the mean of its divisors is an integer number (8479839980430).

Almost surely, 2^{99812937796991} is an apocalyptic number.

99812937796991 is a deficient number, since it is larger than the sum of its proper divisors (1945141968169).

99812937796991 is a wasteful number, since it uses less digits than its factorization.

99812937796991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103481786 (or 103481713 counting only the distinct ones).

The product of its digits is 7499695392, while the sum is 89.

The spelling of 99812937796991 in words is "ninety-nine trillion, eight hundred twelve billion, nine hundred thirty-seven million, seven hundred ninety-six thousand, nine hundred ninety-one".