6402646666 has 16 divisors (see below), whose sum is σ = 10792422144. Its totient is φ = 2826586224.

The previous prime is 6402646631. The next prime is 6402646711. The reversal of 6402646666 is 6666462046.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5352786 + ... + 5353981.

It is an arithmetic number, because the mean of its divisors is an integer number (674526384).

Almost surely, 2^6402646666 is an apocalyptic number.

6402646666 is a deficient number, since it is larger than the sum of its proper divisors (4389775478).

6402646666 is a wasteful number, since it uses less digits than its factorization.

6402646666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10706805.

The product of its (nonzero) digits is 1492992, while the sum is 46.

The square root of 6402646666 is about 80016.5399526873. The cubic root of 6402646666 is about 1856.8914301602.

The spelling of 6402646666 in words is "six billion, four hundred two million, six hundred forty-six thousand, six hundred sixty-six".