6641666661466 has 16 divisors (see below), whose sum is σ = 9970892600040. Its totient is φ = 3318036226560.

The previous prime is 6641666661463. The next prime is 6641666661473.

6641666661466 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 4355005528225 + 2286661133241 = 2086865^2 + 1512171^2 .

It is a super-2 number, since 2×6641666661466² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6641666661398 and 6641666661407.

It is not an unprimeable number, because it can be changed into a prime (6641666661463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32757490 + ... + 32959618.

Almost surely, 2^{6641666661466} is an apocalyptic number.

6641666661466 is a deficient number, since it is larger than the sum of its proper divisors (3329225938574).

6641666661466 is a wasteful number, since it uses less digits than its factorization.

6641666661466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215889.

The product of its digits is 161243136, while the sum is 64.

The spelling of 6641666661466 in words is "six trillion, six hundred forty-one billion, six hundred sixty-six million, six hundred sixty-one thousand, four hundred sixty-six".