18328015161 has 9 divisors (see below), whose sum is σ = 26474386341. Its totient is φ = 12218406012.

The previous prime is 18328015159. The next prime is 18328015183. The reversal of 18328015161 is 16151082381.

The square root of 18328015161 is 135381.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 18328015161 - 2¹ = 18328015159 is a prime.

It is a super-2 number, since 2×18328015161² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18328015151) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 383580 + ... + 428706.

Almost surely, 2^18328015161 is an apocalyptic number.

18328015161 is the 135381-st square number.

18328015161 is the 67691-st centered octagonal number.

It is an amenable number.

18328015161 is a deficient number, since it is larger than the sum of its proper divisors (8146371180).

18328015161 is an frugal number, since it uses more digits than its factorization.

18328015161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90260 (or 45130 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

Multiplying 18328015161 by its sum of digits (36), we get a square (659808545796 = 812286²).

The spelling of 18328015161 in words is "eighteen billion, three hundred twenty-eight million, fifteen thousand, one hundred sixty-one".