6646668945 has 24 divisors (see below), whose sum is σ = 12370944384. Its totient is φ = 3038476896.

The previous prime is 6646668929. The next prime is 6646668953. The reversal of 6646668945 is 5498666466.

It is not a de Polignac number, because 6646668945 - 2⁴ = 6646668929 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4520809 + ... + 4522278.

It is an arithmetic number, because the mean of its divisors is an integer number (515456016).

Almost surely, 2^6646668945 is an apocalyptic number.

It is an amenable number.

6646668945 is a deficient number, since it is larger than the sum of its proper divisors (5724275439).

6646668945 is a wasteful number, since it uses less digits than its factorization.

6646668945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9043109 (or 9043102 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 60.

The square root of 6646668945 is about 81527.1055845846. The cubic root of 6646668945 is about 1880.1883153184.

The spelling of 6646668945 in words is "six billion, six hundred forty-six million, six hundred sixty-eight thousand, nine hundred forty-five".