18209704998 has 32 divisors (see below), whose sum is σ = 37737538560. Its totient is φ = 5850905760.

The previous prime is 18209704991. The next prime is 18209704999. The reversal of 18209704998 is 89940790281.

It is a super-2 number, since 2×18209704998² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18209704991) 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, 19413 + ... + 191823.

It is an arithmetic number, because the mean of its divisors is an integer number (1179298080).

Almost surely, 2^18209704998 is an apocalyptic number.

18209704998 is an abundant number, since it is smaller than the sum of its proper divisors (19527833562).

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

18209704998 is a wasteful number, since it uses less digits than its factorization.

18209704998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173052.

The product of its (nonzero) digits is 2612736, while the sum is 57.

The spelling of 18209704998 in words is "eighteen billion, two hundred nine million, seven hundred four thousand, nine hundred ninety-eight".