22218665197 has 2 divisors, whose sum is σ = 22218665198. Its totient is φ = 22218665196.

The previous prime is 22218665177. The next prime is 22218665251. The reversal of 22218665197 is 79156681222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15964069801 + 6254595396 = 126349^2 + 79086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22218665197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22218665197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22218665177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11109332598 + 11109332599.

It is an arithmetic number, because the mean of its divisors is an integer number (11109332599).

Almost surely, 2^22218665197 is an apocalyptic number.

It is an amenable number.

22218665197 is a deficient number, since it is larger than the sum of its proper divisors (1).

22218665197 is an equidigital number, since it uses as much as digits as its factorization.

22218665197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The spelling of 22218665197 in words is "twenty-two billion, two hundred eighteen million, six hundred sixty-five thousand, one hundred ninety-seven".