6666239907 has 24 divisors (see below), whose sum is σ = 9989657600. Its totient is φ = 4279152240.

The previous prime is 6666239893. The next prime is 6666239911. The reversal of 6666239907 is 7099326666.

It is a happy number.

It is not a de Polignac number, because 6666239907 - 2¹² = 6666235811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6666239507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4513 + ... + 115554.

Almost surely, 2^6666239907 is an apocalyptic number.

6666239907 is a deficient number, since it is larger than the sum of its proper divisors (3323417693).

6666239907 is a wasteful number, since it uses less digits than its factorization.

6666239907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120303 (or 120300 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 54.

The square root of 6666239907 is about 81647.0446923831. The cubic root of 6666239907 is about 1882.0318972829.

The spelling of 6666239907 in words is "six billion, six hundred sixty-six million, two hundred thirty-nine thousand, nine hundred seven".