2666656 has 24 divisors (see below), whose sum is σ = 5292000. Its totient is φ = 1322688.

The previous prime is 2666647. The next prime is 2666659. The reversal of 2666656 is 6566662.

It is a super-2 number, since 2×2666656² = 14222108444672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2666659) 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, 5095 + ... + 5593.

It is an arithmetic number, because the mean of its divisors is an integer number (220500).

2^2666656 is an apocalyptic number.

It is an amenable number.

2666656 is a deficient number, since it is larger than the sum of its proper divisors (2625344).

2666656 is a wasteful number, since it uses less digits than its factorization.

2666656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 668 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 2666656 is about 1632.9898958659. The cubic root of 2666656 is about 138.6720699735.

The spelling of 2666656 in words is "two million, six hundred sixty-six thousand, six hundred fifty-six".