18372220416089 has 2 divisors, whose sum is σ = 18372220416090. Its totient is φ = 18372220416088.

The previous prime is 18372220415971. The next prime is 18372220416091. The reversal of 18372220416089 is 98061402227381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11065968168025 + 7306252248064 = 3326555^2 + 2703008^2 .

It is a cyclic number.

It is not a de Polignac number, because 18372220416089 - 2⁴⁴ = 780034371673 is a prime.

Together with 18372220416091, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18372220416089.

It is not a weakly prime, because it can be changed into another prime (18372220446089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9186110208044 + 9186110208045.

It is an arithmetic number, because the mean of its divisors is an integer number (9186110208045).

Almost surely, 2^{18372220416089} is an apocalyptic number.

It is an amenable number.

18372220416089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18372220416089 is an equidigital number, since it uses as much as digits as its factorization.

18372220416089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 18372220416089 in words is "eighteen trillion, three hundred seventy-two billion, two hundred twenty million, four hundred sixteen thousand, eighty-nine".