6665925609 has 48 divisors (see below), whose sum is σ = 11351832960. Its totient is φ = 3690593280.

The previous prime is 6665925601. The next prime is 6665925613. The reversal of 6665925609 is 9065295666.

It is not a de Polignac number, because 6665925609 - 2³ = 6665925601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6665925601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 244537 + ... + 270425.

It is an arithmetic number, because the mean of its divisors is an integer number (236496520).

Almost surely, 2^6665925609 is an apocalyptic number.

It is an amenable number.

6665925609 is a deficient number, since it is larger than the sum of its proper divisors (4685907351).

6665925609 is a wasteful number, since it uses less digits than its factorization.

6665925609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26030 (or 26027 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 54.

The square root of 6665925609 is about 81645.1199337719. The cubic root of 6665925609 is about 1882.0023189816.

The spelling of 6665925609 in words is "six billion, six hundred sixty-five million, nine hundred twenty-five thousand, six hundred nine".