18738324544 has 63 divisors (see below), whose sum is σ = 37872098373. Its totient is φ = 9198873600.

The previous prime is 18738324523. The next prime is 18738324551. The reversal of 18738324544 is 44542383781.

The square root of 18738324544 is 136888.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 14092538944 + 4645785600 = 118712^2 + 68160^2 .

It is a super-2 number, since 2×18738324544² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 77752264 + ... + 77752504.

Almost surely, 2^18738324544 is an apocalyptic number.

18738324544 is the 136888-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18738324544

18738324544 is an abundant number, since it is smaller than the sum of its proper divisors (19133773829).

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

18738324544 is an frugal number, since it uses more digits than its factorization.

18738324544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636 (or 314 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 49.

Multiplying 18738324544 by its sum of digits (49), we get a square (918177902656 = 958216²).

The spelling of 18738324544 in words is "eighteen billion, seven hundred thirty-eight million, three hundred twenty-four thousand, five hundred forty-four".