18993423264 has 192 divisors, whose sum is σ = 55851586560. Its totient is φ = 5616414720.

The previous prime is 18993423233. The next prime is 18993423271. The reversal of 18993423264 is 46232439981.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6541237 + ... + 6544139.

It is an arithmetic number, because the mean of its divisors is an integer number (290893680).

Almost surely, 2^18993423264 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 18993423264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27925793280).

18993423264 is an abundant number, since it is smaller than the sum of its proper divisors (36858163296).

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

18993423264 is a wasteful number, since it uses less digits than its factorization.

18993423264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3163 (or 3155 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 51.

The spelling of 18993423264 in words is "eighteen billion, nine hundred ninety-three million, four hundred twenty-three thousand, two hundred sixty-four".