3895881665 has 8 divisors (see below), whose sum is σ = 5034677928. Its totient is φ = 2876958720.

The previous prime is 3895881641. The next prime is 3895881673. The reversal of 3895881665 is 5661885983.

It can be written as a sum of positive squares in 4 ways, for example, as 124609 + 3895757056 = 353^2 + 62416^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3895881665 - 2⁶ = 3895881601 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 29968256 + ... + 29968385.

It is an arithmetic number, because the mean of its divisors is an integer number (629334741).

Almost surely, 2^3895881665 is an apocalyptic number.

It is an amenable number.

3895881665 is a deficient number, since it is larger than the sum of its proper divisors (1138796263).

3895881665 is a wasteful number, since it uses less digits than its factorization.

3895881665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59936659.

The product of its digits is 12441600, while the sum is 59.

The square root of 3895881665 is about 62416.9982056170. The cubic root of 3895881665 is about 1573.5066607928.

The spelling of 3895881665 in words is "three billion, eight hundred ninety-five million, eight hundred eighty-one thousand, six hundred sixty-five".