18225157338 has 12 divisors (see below), whose sum is σ = 39487840938. Its totient is φ = 6075052440.

The previous prime is 18225157253. The next prime is 18225157339. The reversal of 18225157338 is 83375152281.

18225157338 is a `hidden beast` number, since 1 + 8 + 22 + 51 + 573 + 3 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17783022609 + 442134729 = 133353^2 + 21027^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18225157293 and 18225157302.

It is not an unprimeable number, because it can be changed into a prime (18225157339) 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 5 ways as a sum of consecutive naturals, for example, 506254353 + ... + 506254388.

Almost surely, 2^18225157338 is an apocalyptic number.

18225157338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18225157338 is an abundant number, since it is smaller than the sum of its proper divisors (21262683600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18225157338 is a wasteful number, since it uses less digits than its factorization.

18225157338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012508749 (or 1012508746 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The spelling of 18225157338 in words is "eighteen billion, two hundred twenty-five million, one hundred fifty-seven thousand, three hundred thirty-eight".