18355007227 has 4 divisors (see below), whose sum is σ = 18412909776. Its totient is φ = 18297104680.

The previous prime is 18355007197. The next prime is 18355007233. The reversal of 18355007227 is 72270055381.

It is a happy number.

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 18355007227 - 2¹⁵ = 18354974459 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 18355007227.

It is not an unprimeable number, because it can be changed into a prime (18355007257) 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, 28950799 + ... + 28951432.

It is an arithmetic number, because the mean of its divisors is an integer number (4603227444).

Almost surely, 2^18355007227 is an apocalyptic number.

18355007227 is a deficient number, since it is larger than the sum of its proper divisors (57902549).

18355007227 is an equidigital number, since it uses as much as digits as its factorization.

18355007227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57902548.

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 18355007227 in words is "eighteen billion, three hundred fifty-five million, seven thousand, two hundred twenty-seven".