195811799011 has 2 divisors, whose sum is σ = 195811799012. Its totient is φ = 195811799010.

The previous prime is 195811798979. The next prime is 195811799089. The reversal of 195811799011 is 110997118591.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195811799011 - 2⁵ = 195811798979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195811799011.

It is not a weakly prime, because it can be changed into another prime (195811799611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97905899505 + 97905899506.

It is an arithmetic number, because the mean of its divisors is an integer number (97905899506).

Almost surely, 2^195811799011 is an apocalyptic number.

195811799011 is a deficient number, since it is larger than the sum of its proper divisors (1).

195811799011 is an equidigital number, since it uses as much as digits as its factorization.

195811799011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 52.

The spelling of 195811799011 in words is "one hundred ninety-five billion, eight hundred eleven million, seven hundred ninety-nine thousand, eleven".