6665450407 has 12 divisors (see below), whose sum is σ = 8373128848. Its totient is φ = 5193856800.

The previous prime is 6665450377. The next prime is 6665450411. The reversal of 6665450407 is 7040545666.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-6665450407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665450417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3933894 + ... + 3935587.

Almost surely, 2^6665450407 is an apocalyptic number.

6665450407 is a deficient number, since it is larger than the sum of its proper divisors (1707678441).

6665450407 is a wasteful number, since it uses less digits than its factorization.

6665450407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7869510 (or 7869499 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 43.

The square root of 6665450407 is about 81642.2097140934. The cubic root of 6665450407 is about 1881.9575963844.

The spelling of 6665450407 in words is "six billion, six hundred sixty-five million, four hundred fifty thousand, four hundred seven".