2666564 has 12 divisors (see below), whose sum is σ = 4746000. Its totient is φ = 1310568.

The previous prime is 2666561. The next prime is 2666581. The reversal of 2666564 is 4656662.

It is a super-2 number, since 2×2666564² = 14221127132192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2666561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5414 + ... + 5885.

It is an arithmetic number, because the mean of its divisors is an integer number (395500).

2^2666564 is an apocalyptic number.

It is an amenable number.

2666564 is a deficient number, since it is larger than the sum of its proper divisors (2079436).

2666564 is a wasteful number, since it uses less digits than its factorization.

2666564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11362 (or 11360 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The square root of 2666564 is about 1632.9617264345. The cubic root of 2666564 is about 138.6704752200.

The spelling of 2666564 in words is "two million, six hundred sixty-six thousand, five hundred sixty-four".