18245552331 has 4 divisors (see below), whose sum is σ = 24327403112. Its totient is φ = 12163701552.

The previous prime is 18245552323. The next prime is 18245552341. The reversal of 18245552331 is 13325554281.

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

It is not a de Polignac number, because 18245552331 - 2³ = 18245552323 is a prime.

It is a super-2 number, since 2×18245552331² (a number of 21 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 18245552331.

It is not an unprimeable number, because it can be changed into a prime (18245552341) 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, 3040925386 + ... + 3040925391.

It is an arithmetic number, because the mean of its divisors is an integer number (6081850778).

Almost surely, 2^18245552331 is an apocalyptic number.

18245552331 is a deficient number, since it is larger than the sum of its proper divisors (6081850781).

18245552331 is an equidigital number, since it uses as much as digits as its factorization.

18245552331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6081850780.

The product of its digits is 144000, while the sum is 39.

The spelling of 18245552331 in words is "eighteen billion, two hundred forty-five million, five hundred fifty-two thousand, three hundred thirty-one".