185196738217 has 2 divisors, whose sum is σ = 185196738218. Its totient is φ = 185196738216.

The previous prime is 185196738197. The next prime is 185196738239. The reversal of 185196738217 is 712837691581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182550253081 + 2646485136 = 427259^2 + 51444^2 .

It is an emirp because it is prime and its reverse (712837691581) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-185196738217 is a prime.

It is not a weakly prime, because it can be changed into another prime (185196738317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92598369108 + 92598369109.

It is an arithmetic number, because the mean of its divisors is an integer number (92598369109).

Almost surely, 2^185196738217 is an apocalyptic number.

It is an amenable number.

185196738217 is a deficient number, since it is larger than the sum of its proper divisors (1).

185196738217 is an equidigital number, since it uses as much as digits as its factorization.

185196738217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 58.

The spelling of 185196738217 in words is "one hundred eighty-five billion, one hundred ninety-six million, seven hundred thirty-eight thousand, two hundred seventeen".