166850185193 has 2 divisors, whose sum is σ = 166850185194. Its totient is φ = 166850185192.

The previous prime is 166850185127. The next prime is 166850185207. The reversal of 166850185193 is 391581058661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141036300304 + 25813884889 = 375548^2 + 160667^2 .

It is a cyclic number.

It is not a de Polignac number, because 166850185193 - 2¹² = 166850181097 is a prime.

It is not a weakly prime, because it can be changed into another prime (166850185993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83425092596 + 83425092597.

It is an arithmetic number, because the mean of its divisors is an integer number (83425092597).

Almost surely, 2^166850185193 is an apocalyptic number.

It is an amenable number.

166850185193 is a deficient number, since it is larger than the sum of its proper divisors (1).

166850185193 is an equidigital number, since it uses as much as digits as its factorization.

166850185193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 53.

The spelling of 166850185193 in words is "one hundred sixty-six billion, eight hundred fifty million, one hundred eighty-five thousand, one hundred ninety-three".