18227197057 has 2 divisors, whose sum is σ = 18227197058. Its totient is φ = 18227197056.

The previous prime is 18227197033. The next prime is 18227197147. The reversal of 18227197057 is 75079172281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18209883136 + 17313921 = 134944^2 + 4161^2 .

It is a cyclic number.

It is not a de Polignac number, because 18227197057 - 2¹⁵ = 18227164289 is a prime.

It is a super-2 number, since 2×18227197057² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18227197057.

It is not a weakly prime, because it can be changed into another prime (18297197057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9113598528 + 9113598529.

It is an arithmetic number, because the mean of its divisors is an integer number (9113598529).

Almost surely, 2^18227197057 is an apocalyptic number.

It is an amenable number.

18227197057 is a deficient number, since it is larger than the sum of its proper divisors (1).

18227197057 is an equidigital number, since it uses as much as digits as its factorization.

18227197057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 493920, while the sum is 49.

The spelling of 18227197057 in words is "eighteen billion, two hundred twenty-seven million, one hundred ninety-seven thousand, fifty-seven".