18893881444564 has 18 divisors (see below), whose sum is σ = 38462544369690. Its totient is φ = 8097377761872.

The previous prime is 18893881444481. The next prime is 18893881444573. The reversal of 18893881444564 is 46544418839881.

It can be written as a sum of positive squares in only one way, i.e., 10620377067664 + 8273504376900 = 3258892^2 + 2876370^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48198676959 + ... + 48198677350.

Almost surely, 2^{18893881444564} is an apocalyptic number.

18893881444564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18893881444564 is an abundant number, since it is smaller than the sum of its proper divisors (19568662925126).

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

18893881444564 is a wasteful number, since it uses less digits than its factorization.

18893881444564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96397354327 (or 96397354318 counting only the distinct ones).

The product of its digits is 849346560, while the sum is 73.

The spelling of 18893881444564 in words is "eighteen trillion, eight hundred ninety-three billion, eight hundred eighty-one million, four hundred forty-four thousand, five hundred sixty-four".