18904644493336 has 64 divisors (see below), whose sum is σ = 41036273510400. Its totient is φ = 7996793980032.

The previous prime is 18904644493291. The next prime is 18904644493369. The reversal of 18904644493336 is 63339444640981.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12732165 + ... + 14139211.

It is an arithmetic number, because the mean of its divisors is an integer number (641191773600).

Almost surely, 2^{18904644493336} 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 18904644493336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20518136755200).

18904644493336 is an abundant number, since it is smaller than the sum of its proper divisors (22131629017064).

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

18904644493336 is a wasteful number, since it uses less digits than its factorization.

18904644493336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410176 (or 1410172 counting only the distinct ones).

The product of its (nonzero) digits is 161243136, while the sum is 64.

The spelling of 18904644493336 in words is "eighteen trillion, nine hundred four billion, six hundred forty-four million, four hundred ninety-three thousand, three hundred thirty-six".