18331307242 has 8 divisors (see below), whose sum is σ = 27497535300. Its totient is φ = 9165462144.

The previous prime is 18331307231. The next prime is 18331307249. The reversal of 18331307242 is 24270313381.

It can be written as a sum of positive squares in 2 ways, for example, as 18157832001 + 173475241 = 134751^2 + 13171^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18331307198 and 18331307207.

It is not an unprimeable number, because it can be changed into a prime (18331307249) 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, 142234 + ... + 238522.

Almost surely, 2^18331307242 is an apocalyptic number.

18331307242 is a deficient number, since it is larger than the sum of its proper divisors (9166228058).

18331307242 is an equidigital number, since it uses as much as digits as its factorization.

18331307242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191480.

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 18331307242 in words is "eighteen billion, three hundred thirty-one million, three hundred seven thousand, two hundred forty-two".