6664450544666 has 16 divisors (see below), whose sum is σ = 10128858661800. Its totient is φ = 3288311440128.

The previous prime is 6664450544629. The next prime is 6664450544699.

6664450544666 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 4200979037641 + 2463471507025 = 2049629^2 + 1569545^2 .

It is a super-2 number, since 2×6664450544666² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6664450544599 and 6664450544608.

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, 36688115 + ... + 36869318.

Almost surely, 2^{6664450544666} is an apocalyptic number.

6664450544666 is a deficient number, since it is larger than the sum of its proper divisors (3464408117134).

6664450544666 is a wasteful number, since it uses less digits than its factorization.

6664450544666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73558033.

The product of its (nonzero) digits is 298598400, while the sum is 62.

The spelling of 6664450544666 in words is "six trillion, six hundred sixty-four billion, four hundred fifty million, five hundred forty-four thousand, six hundred sixty-six".