195821065 has 16 divisors (see below), whose sum is σ = 257437440. Its totient is φ = 141809920.

The previous prime is 195821051. The next prime is 195821089. The reversal of 195821065 is 560128591.

It is not a de Polignac number, because 195821065 - 2⁵ = 195821033 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5697 + ... + 20593.

It is an arithmetic number, because the mean of its divisors is an integer number (16089840).

Almost surely, 2^195821065 is an apocalyptic number.

It is an amenable number.

195821065 is a deficient number, since it is larger than the sum of its proper divisors (61616375).

195821065 is a wasteful number, since it uses less digits than its factorization.

195821065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15152.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 195821065 is about 13993.6080050858. The cubic root of 195821065 is about 580.7017516667.

The spelling of 195821065 in words is "one hundred ninety-five million, eight hundred twenty-one thousand, sixty-five".