99998644689999 has 16 divisors (see below), whose sum is σ = 161613971216640. Its totient is φ = 60605239205880.

The previous prime is 99998644689997. The next prime is 99998644690033.

99998644689999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99998644689999 - 2¹ = 99998644689997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99998644689999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99998644689997) 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, 168347886387 + ... + 168347886980.

It is an arithmetic number, because the mean of its divisors is an integer number (10100873201040).

Almost surely, 2^{99998644689999} is an apocalyptic number.

99998644689999 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

99998644689999 is a deficient number, since it is larger than the sum of its proper divisors (61615326526641).

99998644689999 is a wasteful number, since it uses less digits than its factorization.

99998644689999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336695773387 (or 336695773381 counting only the distinct ones).

The product of its digits is 1586874322944, while the sum is 108.

The spelling of 99998644689999 in words is "ninety-nine trillion, nine hundred ninety-eight billion, six hundred forty-four million, six hundred eighty-nine thousand, nine hundred ninety-nine".