18520222177 has 2 divisors, whose sum is σ = 18520222178. Its totient is φ = 18520222176.

The previous prime is 18520222159. The next prime is 18520222183. The reversal of 18520222177 is 77122202581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15152625216 + 3367596961 = 123096^2 + 58031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18520222177 is a prime.

It is not a weakly prime, because it can be changed into another prime (18520222187) 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, 9260111088 + 9260111089.

It is an arithmetic number, because the mean of its divisors is an integer number (9260111089).

Almost surely, 2^18520222177 is an apocalyptic number.

It is an amenable number.

18520222177 is a deficient number, since it is larger than the sum of its proper divisors (1).

18520222177 is an equidigital number, since it uses as much as digits as its factorization.

18520222177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31360, while the sum is 37.

The spelling of 18520222177 in words is "eighteen billion, five hundred twenty million, two hundred twenty-two thousand, one hundred seventy-seven".