3866615565 has 8 divisors (see below), whose sum is σ = 6186584928. Its totient is φ = 2062194960.

The previous prime is 3866615531. The next prime is 3866615569. The reversal of 3866615565 is 5655166683.

It is a happy number.

3866615565 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 3866615565 - 2¹⁹ = 3866091277 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3866615569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128887171 + ... + 128887200.

It is an arithmetic number, because the mean of its divisors is an integer number (773323116).

Almost surely, 2^3866615565 is an apocalyptic number.

It is an amenable number.

3866615565 is a deficient number, since it is larger than the sum of its proper divisors (2319969363).

3866615565 is a wasteful number, since it uses less digits than its factorization.

3866615565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257774379.

The product of its digits is 3888000, while the sum is 51.

The square root of 3866615565 is about 62182.1161187041. The cubic root of 3866615565 is about 1569.5566607622.

The spelling of 3866615565 in words is "three billion, eight hundred sixty-six million, six hundred fifteen thousand, five hundred sixty-five".