99698832991 has 4 divisors (see below), whose sum is σ = 99701497984. Its totient is φ = 99696168000.

The previous prime is 99698832979. The next prime is 99698833067. The reversal of 99698832991 is 19923889699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19923889699 = 7 ⋅2846269957.

It is a cyclic number.

It is not a de Polignac number, because 99698832991 - 2²¹ = 99696735839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99698832931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1275570 + ... + 1351471.

It is an arithmetic number, because the mean of its divisors is an integer number (24925374496).

Almost surely, 2^99698832991 is an apocalyptic number.

99698832991 is a deficient number, since it is larger than the sum of its proper divisors (2664993).

99698832991 is a wasteful number, since it uses less digits than its factorization.

99698832991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2664992.

The product of its digits is 136048896, while the sum is 73.

The spelling of 99698832991 in words is "ninety-nine billion, six hundred ninety-eight million, eight hundred thirty-two thousand, nine hundred ninety-one".