18156484516 has 27 divisors (see below), whose sum is σ = 32177375139. Its totient is φ = 8964381888.

The previous prime is 18156484513. The next prime is 18156484529. The reversal of 18156484516 is 61548465181.

The square root of 18156484516 is 134746.

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

It can be written as a sum of positive squares in 4 ways, for example, as 810540900 + 17345943616 = 28470^2 + 131704^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18156484516.

It is not an unprimeable number, because it can be changed into a prime (18156484513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 23984410 + ... + 23985166.

Almost surely, 2^18156484516 is an apocalyptic number.

18156484516 is the 134746-th square number.

It is an amenable number.

18156484516 is a deficient number, since it is larger than the sum of its proper divisors (14020890623).

18156484516 is an frugal number, since it uses more digits than its factorization.

18156484516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696 (or 848 counting only the distinct ones).

The product of its digits is 921600, while the sum is 49.

Multiplying 18156484516 by its sum of digits (49), we get a square (889667741284 = 943222²).

The spelling of 18156484516 in words is "eighteen billion, one hundred fifty-six million, four hundred eighty-four thousand, five hundred sixteen".