18603444736 has 40 divisors (see below), whose sum is σ = 37225054944. Its totient is φ = 9288084480.

The previous prime is 18603444733. The next prime is 18603444763. The reversal of 18603444736 is 63744430681.

It is a super-2 number, since 2×18603444736² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18603444733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327501 + ... + 380083.

Almost surely, 2^18603444736 is an apocalyptic number.

18603444736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18603444736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18612527472).

18603444736 is an abundant number, since it is smaller than the sum of its proper divisors (18621610208).

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

18603444736 is an frugal number, since it uses more digits than its factorization.

18603444736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53292 (or 53276 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 46.

The spelling of 18603444736 in words is "eighteen billion, six hundred three million, four hundred forty-four thousand, seven hundred thirty-six".