195665047 has 2 divisors, whose sum is σ = 195665048. Its totient is φ = 195665046.

The previous prime is 195665027. The next prime is 195665081. The reversal of 195665047 is 740566591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195665047 - 2²⁷ = 61447319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 195664994 and 195665012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195665017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97832523 + 97832524.

It is an arithmetic number, because the mean of its divisors is an integer number (97832524).

Almost surely, 2^195665047 is an apocalyptic number.

195665047 is a deficient number, since it is larger than the sum of its proper divisors (1).

195665047 is an equidigital number, since it uses as much as digits as its factorization.

195665047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 195665047 is about 13988.0322776293. The cubic root of 195665047 is about 580.5474883890.

The spelling of 195665047 in words is "one hundred ninety-five million, six hundred sixty-five thousand, forty-seven".