195681865 has 4 divisors (see below), whose sum is σ = 234818244. Its totient is φ = 156545488.

The previous prime is 195681851. The next prime is 195681901. The reversal of 195681865 is 568186591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 144072009 + 51609856 = 12003^2 + 7184^2 .

It is a cyclic number.

It is not a de Polignac number, because 195681865 - 2⁷ = 195681737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19568182 + ... + 19568191.

It is an arithmetic number, because the mean of its divisors is an integer number (58704561).

Almost surely, 2^195681865 is an apocalyptic number.

It is an amenable number.

195681865 is a deficient number, since it is larger than the sum of its proper divisors (39136379).

195681865 is an equidigital number, since it uses as much as digits as its factorization.

195681865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39136378.

The product of its digits is 518400, while the sum is 49.

The square root of 195681865 is about 13988.6334214604. The cubic root of 195681865 is about 580.5641211807.

The spelling of 195681865 in words is "one hundred ninety-five million, six hundred eighty-one thousand, eight hundred sixty-five".