6466668666646 has 16 divisors (see below), whose sum is σ = 9786235085424. Its totient is φ = 3204592593664.

The previous prime is 6466668666637. The next prime is 6466668666691.

6466668666646 is nontrivially palindromic in base 10.

It is a congruent number.

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, 5221041 + ... + 6339763.

It is an arithmetic number, because the mean of its divisors is an integer number (611639692839).

Almost surely, 2^{6466668666646} is an apocalyptic number.

6466668666646 is a deficient number, since it is larger than the sum of its proper divisors (3319566418778).

6466668666646 is a wasteful number, since it uses less digits than its factorization.

6466668666646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144415.

The product of its digits is 7739670528, while the sum is 76.

The spelling of 6466668666646 in words is "six trillion, four hundred sixty-six billion, six hundred sixty-eight million, six hundred sixty-six thousand, six hundred forty-six".