195564681 has 12 divisors (see below), whose sum is σ = 304211908. Its totient is φ = 120347424.

The previous prime is 195564679. The next prime is 195564703. The reversal of 195564681 is 186465591.

195564681 is a `hidden beast` number, since 1 + 9 + 5 + 564 + 6 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16941456 + 178623225 = 4116^2 + 13365^2 .

It is not a de Polignac number, because 195564681 - 2¹ = 195564679 is a prime.

It is a super-2 number, since 2×195564681² = 76491088909263522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (195560681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 835630 + ... + 835863.

Almost surely, 2^195564681 is an apocalyptic number.

It is an amenable number.

195564681 is a deficient number, since it is larger than the sum of its proper divisors (108647227).

195564681 is a wasteful number, since it uses less digits than its factorization.

195564681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671512 (or 1671509 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 195564681 is about 13984.4442506665. Note that the first 3 decimals coincide. The cubic root of 195564681 is about 580.4482078487.

The spelling of 195564681 in words is "one hundred ninety-five million, five hundred sixty-four thousand, six hundred eighty-one".