18291018192 has 80 divisors (see below), whose sum is σ = 49952784960. Its totient is φ = 5751254016.

The previous prime is 18291018149. The next prime is 18291018209. The reversal of 18291018192 is 29181019281.

It is a happy number.

It is a super-2 number, since 2×18291018192² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169458 + ... + 255534.

It is an arithmetic number, because the mean of its divisors is an integer number (624409812).

Almost surely, 2^18291018192 is an apocalyptic number.

18291018192 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18291018192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24976392480).

18291018192 is an abundant number, since it is smaller than the sum of its proper divisors (31661766768).

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

18291018192 is a wasteful number, since it uses less digits than its factorization.

18291018192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86340 (or 86334 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 42.

It can be divided in two parts, 182910 and 18192, that added together give a palindrome (201102).

The spelling of 18291018192 in words is "eighteen billion, two hundred ninety-one million, eighteen thousand, one hundred ninety-two".