18944108436 has 96 divisors (see below), whose sum is σ = 48570633216. Its totient is φ = 5699232000.

The previous prime is 18944108431. The next prime is 18944108489. The reversal of 18944108436 is 63480144981.

18944108436 = T₁₁₄₇₁ + T₁₁₄₇₂ + ... + T₁₁₇₅₁.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18944108431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12276681 + ... + 12278223.

It is an arithmetic number, because the mean of its divisors is an integer number (505944096).

Almost surely, 2^18944108436 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 18944108436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24285316608).

18944108436 is an abundant number, since it is smaller than the sum of its proper divisors (29626524780).

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

18944108436 is a wasteful number, since it uses less digits than its factorization.

18944108436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173 (or 2171 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The spelling of 18944108436 in words is "eighteen billion, nine hundred forty-four million, one hundred eight thousand, four hundred thirty-six".