18197412992 has 64 divisors (see below), whose sum is σ = 39614343840. Its totient is φ = 8257751040.

The previous prime is 18197412991. The next prime is 18197413021. The reversal of 18197412992 is 29921479181.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×18197412992² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18197412991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 858263 + ... + 879209.

Almost surely, 2^18197412992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18197412992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19807171920).

18197412992 is an abundant number, since it is smaller than the sum of its proper divisors (21416930848).

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

18197412992 is a wasteful number, since it uses less digits than its factorization.

18197412992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21589 (or 21577 counting only the distinct ones).

The product of its digits is 653184, while the sum is 53.

The spelling of 18197412992 in words is "eighteen billion, one hundred ninety-seven million, four hundred twelve thousand, nine hundred ninety-two".