18326219544 has 80 divisors (see below), whose sum is σ = 51353842320. Its totient is φ = 6105948480.

The previous prime is 18326219537. The next prime is 18326219551. The reversal of 18326219544 is 44591262381.

18326219544 is a `hidden beast` number, since 1 + 8 + 32 + 62 + 19 + 544 = 666.

It is an interprime number because it is at equal distance from previous prime (18326219537) and next prime (18326219551).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18326219544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1803502 + ... + 1813634.

It is an arithmetic number, because the mean of its divisors is an integer number (641923029).

Almost surely, 2^18326219544 is an apocalyptic number.

It is an amenable number.

18326219544 is an abundant number, since it is smaller than the sum of its proper divisors (33027622776).

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

18326219544 is a wasteful number, since it uses less digits than its factorization.

18326219544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12942 (or 12929 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The spelling of 18326219544 in words is "eighteen billion, three hundred twenty-six million, two hundred nineteen thousand, five hundred forty-four".