195665011 has 2 divisors, whose sum is σ = 195665012. Its totient is φ = 195665010.

The previous prime is 195665009. The next prime is 195665017. The reversal of 195665011 is 110566591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195665011 - 2¹ = 195665009 is a prime.

Together with 195665009, it forms a pair of twin primes.

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, 97832505 + 97832506.

It is an arithmetic number, because the mean of its divisors is an integer number (97832506).

Almost surely, 2^195665011 is an apocalyptic number.

195665011 is a deficient number, since it is larger than the sum of its proper divisors (1).

195665011 is an equidigital number, since it uses as much as digits as its factorization.

195665011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 195665011 is about 13988.0309908150. The cubic root of 195665011 is about 580.5474527844.

The spelling of 195665011 in words is "one hundred ninety-five million, six hundred sixty-five thousand, eleven".