18385344227 has 2 divisors, whose sum is σ = 18385344228. Its totient is φ = 18385344226.

The previous prime is 18385344221. The next prime is 18385344287. The reversal of 18385344227 is 72244358381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18385344227 - 2¹⁸ = 18385082083 is a prime.

It is not a weakly prime, because it can be changed into another prime (18385344221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9192672113 + 9192672114.

It is an arithmetic number, because the mean of its divisors is an integer number (9192672114).

Almost surely, 2^18385344227 is an apocalyptic number.

18385344227 is a deficient number, since it is larger than the sum of its proper divisors (1).

18385344227 is an equidigital number, since it uses as much as digits as its factorization.

18385344227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 47.

The spelling of 18385344227 in words is "eighteen billion, three hundred eighty-five million, three hundred forty-four thousand, two hundred twenty-seven".