185193157997 has 2 divisors, whose sum is σ = 185193157998. Its totient is φ = 185193157996.

The previous prime is 185193157973. The next prime is 185193158011. The reversal of 185193157997 is 799751391581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185191654921 + 1503076 = 430339^2 + 1226^2 .

It is an emirp because it is prime and its reverse (799751391581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 185193157997 - 2⁸ = 185193157741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185193157967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92596578998 + 92596578999.

It is an arithmetic number, because the mean of its divisors is an integer number (92596578999).

Almost surely, 2^185193157997 is an apocalyptic number.

It is an amenable number.

185193157997 is a deficient number, since it is larger than the sum of its proper divisors (1).

185193157997 is an equidigital number, since it uses as much as digits as its factorization.

185193157997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21432600, while the sum is 65.

The spelling of 185193157997 in words is "one hundred eighty-five billion, one hundred ninety-three million, one hundred fifty-seven thousand, nine hundred ninety-seven".