18650916197 has 2 divisors, whose sum is σ = 18650916198. Its totient is φ = 18650916196.

The previous prime is 18650916149. The next prime is 18650916241. The reversal of 18650916197 is 79161905681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9531812161 + 9119104036 = 97631^2 + 95494^2 .

It is a cyclic number.

It is not a de Polignac number, because 18650916197 - 2¹² = 18650912101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18650916797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9325458098 + 9325458099.

It is an arithmetic number, because the mean of its divisors is an integer number (9325458099).

Almost surely, 2^18650916197 is an apocalyptic number.

It is an amenable number.

18650916197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18650916197 is an equidigital number, since it uses as much as digits as its factorization.

18650916197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 53.

The spelling of 18650916197 in words is "eighteen billion, six hundred fifty million, nine hundred sixteen thousand, one hundred ninety-seven".