195665081 has 2 divisors, whose sum is σ = 195665082. Its totient is φ = 195665080.

The previous prime is 195665047. The next prime is 195665101. The reversal of 195665081 is 180566591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187936681 + 7728400 = 13709^2 + 2780^2 .

It is a cyclic number.

It is not a de Polignac number, because 195665081 - 2⁶ = 195665017 is a prime.

It is a super-2 number, since 2×195665081² = 76569647845473122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195665011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97832540 + 97832541.

It is an arithmetic number, because the mean of its divisors is an integer number (97832541).

Almost surely, 2^195665081 is an apocalyptic number.

It is an amenable number.

195665081 is a deficient number, since it is larger than the sum of its proper divisors (1).

195665081 is an equidigital number, since it uses as much as digits as its factorization.

195665081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 195665081 is about 13988.0334929539. The cubic root of 195665081 is about 580.5475220155.

The spelling of 195665081 in words is "one hundred ninety-five million, six hundred sixty-five thousand, eighty-one".