2856331665 has 24 divisors (see below), whose sum is σ = 5401064448. Its totient is φ = 1384887840.

The previous prime is 2856331627. The next prime is 2856331679. The reversal of 2856331665 is 5661336582.

2856331665 is a `hidden beast` number, since 2 + 8 + 5 + 633 + 1 + 6 + 6 + 5 = 666.

It is not a de Polignac number, because 2856331665 - 2⁶ = 2856331601 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 2856331665.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2884689 + ... + 2885678.

It is an arithmetic number, because the mean of its divisors is an integer number (225044352).

Almost surely, 2^2856331665 is an apocalyptic number.

It is an amenable number.

2856331665 is a deficient number, since it is larger than the sum of its proper divisors (2544732783).

2856331665 is a wasteful number, since it uses less digits than its factorization.

2856331665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5770389 (or 5770386 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 2856331665 is about 53444.6598361333. The cubic root of 2856331665 is about 1418.8491079698.

The spelling of 2856331665 in words is "two billion, eight hundred fifty-six million, three hundred thirty-one thousand, six hundred sixty-five".