195666241 has 2 divisors, whose sum is σ = 195666242. Its totient is φ = 195666240.

The previous prime is 195666187. The next prime is 195666257. The reversal of 195666241 is 142666591.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99920016 + 95746225 = 9996^2 + 9785^2 .

It is a cyclic number.

It is not a de Polignac number, because 195666241 - 2¹¹ = 195664193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 195666194 and 195666203.

It is not a weakly prime, because it can be changed into another prime (195666041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97833120 + 97833121.

It is an arithmetic number, because the mean of its divisors is an integer number (97833121).

Almost surely, 2^195666241 is an apocalyptic number.

It is an amenable number.

195666241 is a deficient number, since it is larger than the sum of its proper divisors (1).

195666241 is an equidigital number, since it uses as much as digits as its factorization.

195666241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 195666241 is about 13988.0749569053. The cubic root of 195666241 is about 580.5486692715.

The spelling of 195666241 in words is "one hundred ninety-five million, six hundred sixty-six thousand, two hundred forty-one".