6466666646 has 24 divisors (see below), whose sum is σ = 10673952240. Its totient is φ = 2936094480.

The previous prime is 6466666631. The next prime is 6466666667.

It is a happy number.

6466666646 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6466666591 and 6466666600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207860 + ... + 236936.

It is an arithmetic number, because the mean of its divisors is an integer number (444748010).

Almost surely, 2^6466666646 is an apocalyptic number.

6466666646 is a deficient number, since it is larger than the sum of its proper divisors (4207285594).

6466666646 is a wasteful number, since it uses less digits than its factorization.

6466666646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30020 (or 30009 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 56.

The square root of 6466666646 is about 80415.5870835997. The cubic root of 6466666646 is about 1863.0599270583.

The spelling of 6466666646 in words is "six billion, four hundred sixty-six million, six hundred sixty-six thousand, six hundred forty-six".