18192173540 has 12 divisors (see below), whose sum is σ = 38203564476. Its totient is φ = 7276869408.

The previous prime is 18192173537. The next prime is 18192173551. The reversal of 18192173540 is 4537129181.

It can be written as a sum of positive squares in 2 ways, for example, as 7180189696 + 11011983844 = 84736^2 + 104938^2 .

It is a super-2 number, since 2×18192173540² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454804319 + ... + 454804358.

It is an arithmetic number, because the mean of its divisors is an integer number (3183630373).

Almost surely, 2^18192173540 is an apocalyptic number.

18192173540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18192173540 is an abundant number, since it is smaller than the sum of its proper divisors (20011390936).

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

18192173540 is a wasteful number, since it uses less digits than its factorization.

18192173540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909608686 (or 909608684 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 18192173540 in words is "eighteen billion, one hundred ninety-two million, one hundred seventy-three thousand, five hundred forty".