18045825331 has 4 divisors (see below), whose sum is σ = 18668095200. Its totient is φ = 17423555464.

The previous prime is 18045825313. The next prime is 18045825337. The reversal of 18045825331 is 13352854081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18045825331 - 2⁵ = 18045825299 is a prime.

It is a super-2 number, since 2×18045825331² (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 (18045825337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311134891 + ... + 311134948.

It is an arithmetic number, because the mean of its divisors is an integer number (4667023800).

Almost surely, 2^18045825331 is an apocalyptic number.

18045825331 is a deficient number, since it is larger than the sum of its proper divisors (622269869).

18045825331 is an equidigital number, since it uses as much as digits as its factorization.

18045825331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622269868.

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 18045825331 in words is "eighteen billion, forty-five million, eight hundred twenty-five thousand, three hundred thirty-one".