18436173804 has 324 divisors, whose sum is σ = 54176594472. Its totient is φ = 5467150080.

The previous prime is 18436173793. The next prime is 18436173817. The reversal of 18436173804 is 40837163481.

It is a tau number, because it is divible by the number of its divisors (324).

It is a self number, because there is not a number n which added to its sum of digits gives 18436173804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 428748207 + ... + 428748249.

Almost surely, 2^18436173804 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 18436173804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27088297236).

18436173804 is an abundant number, since it is smaller than the sum of its proper divisors (35740420668).

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

18436173804 is an equidigital number, since it uses as much as digits as its factorization.

18436173804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 18436173804 in words is "eighteen billion, four hundred thirty-six million, one hundred seventy-three thousand, eight hundred four".