195665963 has 2 divisors, whose sum is σ = 195665964. Its totient is φ = 195665962.

The previous prime is 195665947. The next prime is 195665993. The reversal of 195665963 is 369566591.

It is a weak prime.

It is an emirp because it is prime and its reverse (369566591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195665963 - 2⁴ = 195665947 is a prime.

It is not a weakly prime, because it can be changed into another prime (195665993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97832981 + 97832982.

It is an arithmetic number, because the mean of its divisors is an integer number (97832982).

Almost surely, 2^195665963 is an apocalyptic number.

195665963 is a deficient number, since it is larger than the sum of its proper divisors (1).

195665963 is an equidigital number, since it uses as much as digits as its factorization.

195665963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1312200, while the sum is 50.

The square root of 195665963 is about 13988.0650198660. The cubic root of 195665963 is about 580.5483943261.

The spelling of 195665963 in words is "one hundred ninety-five million, six hundred sixty-five thousand, nine hundred sixty-three".