6665544455666 has 16 divisors (see below), whose sum is σ = 10321133971200. Its totient is φ = 3225172526640.

The previous prime is 6665544455659. The next prime is 6665544455737.

6665544455666 is nontrivially palindromic in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6665544455596 and 6665544455605.

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, 728360 + ... + 3723116.

It is an arithmetic number, because the mean of its divisors is an integer number (645070873200).

Almost surely, 2^{6665544455666} is an apocalyptic number.

6665544455666 is a deficient number, since it is larger than the sum of its proper divisors (3655589515534).

6665544455666 is a wasteful number, since it uses less digits than its factorization.

6665544455666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030689.

The product of its digits is 1866240000, while the sum is 68.

The spelling of 6665544455666 in words is "six trillion, six hundred sixty-five billion, five hundred forty-four million, four hundred fifty-five thousand, six hundred sixty-six".