18432311306 has 4 divisors (see below), whose sum is σ = 27648466962. Its totient is φ = 9216155652.

The previous prime is 18432311299. The next prime is 18432311309. The reversal of 18432311306 is 60311323481.

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

It can be written as a sum of positive squares in only one way, i.e., 13330780681 + 5101530625 = 115459^2 + 71425^2 .

It is not an unprimeable number, because it can be changed into a prime (18432311309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4608077825 + ... + 4608077828.

Almost surely, 2^18432311306 is an apocalyptic number.

18432311306 is a deficient number, since it is larger than the sum of its proper divisors (9216155656).

18432311306 is an equidigital number, since it uses as much as digits as its factorization.

18432311306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9216155655.

The product of its (nonzero) digits is 10368, while the sum is 32.

Adding to 18432311306 its reverse (60311323481), we get a palindrome (78743634787).

The spelling of 18432311306 in words is "eighteen billion, four hundred thirty-two million, three hundred eleven thousand, three hundred six".