18055028161 has 3 divisors (see below), whose sum is σ = 18055162531. Its totient is φ = 18054893792.

The previous prime is 18055028063. The next prime is 18055028227. The reversal of 18055028161 is 16182055081.

The square root of 18055028161 is 134369.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 9376242561 + 8678785600 = 96831^2 + 93160^2 .

It is not a de Polignac number, because 18055028161 - 2⁹ = 18055027649 is a prime.

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 18055028161.

It is not an unprimeable number, because it can be changed into a prime (18055008161) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 67185 + ... + 201553.

Almost surely, 2^18055028161 is an apocalyptic number.

18055028161 is the 134369-th square number.

18055028161 is the 67185-th centered octagonal number.

It is an amenable number.

18055028161 is a deficient number, since it is larger than the sum of its proper divisors (134370).

18055028161 is an frugal number, since it uses more digits than its factorization.

18055028161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268738 (or 134369 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 37.

The spelling of 18055028161 in words is "eighteen billion, fifty-five million, twenty-eight thousand, one hundred sixty-one".