18228510169 has 27 divisors (see below), whose sum is σ = 19420754871. Its totient is φ = 17108847360.

The previous prime is 18228510161. The next prime is 18228510191. The reversal of 18228510169 is 96101582281.

The square root of 18228510169 is 135013.

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

It can be written as a sum of positive squares in 13 ways, for example, as 16148055625 + 2080454544 = 127075^2 + 45612^2 .

It is not a de Polignac number, because 18228510169 - 2³ = 18228510161 is a prime.

It is a super-2 number, since 2×18228510169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18228510161) 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 26 ways as a sum of consecutive naturals, for example, 204814677 + ... + 204814765.

Almost surely, 2^18228510169 is an apocalyptic number.

18228510169 is the 135013-rd square number.

18228510169 is the 67507-th centered octagonal number.

It is an amenable number.

18228510169 is a deficient number, since it is larger than the sum of its proper divisors (1192244702).

18228510169 is an frugal number, since it uses more digits than its factorization.

18228510169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 43.

The spelling of 18228510169 in words is "eighteen billion, two hundred twenty-eight million, five hundred ten thousand, one hundred sixty-nine".