18183389225 has 6 divisors (see below), whose sum is σ = 22547402670. Its totient is φ = 14546711360.

The previous prime is 18183389221. The next prime is 18183389249. The reversal of 18183389225 is 52298338181.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1015314496 + 17168074729 = 31864^2 + 131027^2 .

It is not a de Polignac number, because 18183389225 - 2² = 18183389221 is a prime.

It is a super-2 number, since 2×18183389225² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18183389221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 363667760 + ... + 363667809.

It is an arithmetic number, because the mean of its divisors is an integer number (3757900445).

Almost surely, 2^18183389225 is an apocalyptic number.

It is an amenable number.

18183389225 is a deficient number, since it is larger than the sum of its proper divisors (4364013445).

18183389225 is an equidigital number, since it uses as much as digits as its factorization.

18183389225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727335579 (or 727335574 counting only the distinct ones).

The product of its digits is 829440, while the sum is 50.

The spelling of 18183389225 in words is "eighteen billion, one hundred eighty-three million, three hundred eighty-nine thousand, two hundred twenty-five".