6656642466566 has 16 divisors (see below), whose sum is σ = 10197574211520. Its totient is φ = 3257453347200.

The previous prime is 6656642466553. The next prime is 6656642466581.

6656642466566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6656642466496 and 6656642466505.

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, 5645966 + ... + 6722366.

It is an arithmetic number, because the mean of its divisors is an integer number (637348388220).

Almost surely, 2^{6656642466566} is an apocalyptic number.

6656642466566 is a deficient number, since it is larger than the sum of its proper divisors (3540931744954).

6656642466566 is a wasteful number, since it uses less digits than its factorization.

6656642466566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142239.

The product of its digits is 1343692800, while the sum is 68.

The spelling of 6656642466566 in words is "six trillion, six hundred fifty-six billion, six hundred forty-two million, four hundred sixty-six thousand, five hundred sixty-six".