2560666 has 4 divisors (see below), whose sum is σ = 3841002. Its totient is φ = 1280332.

The previous prime is 2560661. The next prime is 2560669. The reversal of 2560666 is 6660652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2544025 + 16641 = 1595^2 + 129^2 .

It is not an unprimeable number, because it can be changed into a prime (2560661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640165 + ... + 640168.

2^2560666 is an apocalyptic number.

2560666 is a deficient number, since it is larger than the sum of its proper divisors (1280336).

2560666 is a wasteful number, since it uses less digits than its factorization.

2560666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280335.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 2560666 is about 1600.2081114655. The cubic root of 2560666 is about 136.8099376637.

The spelling of 2560666 in words is "two million, five hundred sixty thousand, six hundred sixty-six".