18197920998 has 16 divisors (see below), whose sum is σ = 40439824560. Its totient is φ = 6065973648.

The previous prime is 18197920991. The next prime is 18197921017. The reversal of 18197920998 is 89902979181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18197920991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168499215 + ... + 168499322.

It is an arithmetic number, because the mean of its divisors is an integer number (2527489035).

Almost surely, 2^18197920998 is an apocalyptic number.

18197920998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18197920998 is an abundant number, since it is smaller than the sum of its proper divisors (22241903562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18197920998 is a wasteful number, since it uses less digits than its factorization.

18197920998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336998548 (or 336998542 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 63.

The spelling of 18197920998 in words is "eighteen billion, one hundred ninety-seven million, nine hundred twenty thousand, nine hundred ninety-eight".