18506944794 has 64 divisors (see below), whose sum is σ = 41982917760. Its totient is φ = 5391671040.

The previous prime is 18506944783. The next prime is 18506944823. The reversal of 18506944794 is 49744960581.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4771584 + ... + 4775460.

It is an arithmetic number, because the mean of its divisors is an integer number (655983090).

Almost surely, 2^18506944794 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18506944794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20991458880).

18506944794 is an abundant number, since it is smaller than the sum of its proper divisors (23475972966).

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

18506944794 is a wasteful number, since it uses less digits than its factorization.

18506944794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7135.

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 18506944794 in words is "eighteen billion, five hundred six million, nine hundred forty-four thousand, seven hundred ninety-four".