18618664054225 has 9 divisors (see below), whose sum is σ = 23087170179867. Its totient is φ = 14894913983640.

The previous prime is 18618664054223. The next prime is 18618664054253. The reversal of 18618664054225 is 52245046681681.

The square root of 18618664054225 is 4314935.

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., 6702719059521 + 11915944994704 = 2588961^2 + 3451948^2 .

It is not a de Polignac number, because 18618664054225 - 2¹ = 18618664054223 is a prime.

It is a super-2 number, since 2×18618664054225² (a number of 27 digits) contains 22 as substring.

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 18618664054225.

It is not an unprimeable number, because it can be changed into a prime (18618664054223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21143182 + ... + 22006168.

Almost surely, 2^{18618664054225} is an apocalyptic number.

18618664054225 is the 4314935-th square number.

18618664054225 is the 2157468-th centered octagonal number.

It is an amenable number.

18618664054225 is a deficient number, since it is larger than the sum of its proper divisors (4468506125642).

18618664054225 is an frugal number, since it uses more digits than its factorization.

18618664054225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725984 (or 862992 counting only the distinct ones).

The product of its (nonzero) digits is 22118400, while the sum is 58.

The spelling of 18618664054225 in words is "eighteen trillion, six hundred eighteen billion, six hundred sixty-four million, fifty-four thousand, two hundred twenty-five".