2566664 has 8 divisors (see below), whose sum is σ = 4812510. Its totient is φ = 1283328.

The previous prime is 2566661. The next prime is 2566667. The reversal of 2566664 is 4666652.

It is an interprime number because it is at equal distance from previous prime (2566661) and next prime (2566667).

It can be written as a sum of positive squares in only one way, i.e., 1844164 + 722500 = 1358^2 + 850^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (2566661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160409 + ... + 160424.

2^2566664 is an apocalyptic number.

It is an amenable number.

2566664 is a deficient number, since it is larger than the sum of its proper divisors (2245846).

2566664 is a wasteful number, since it uses less digits than its factorization.

2566664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320839 (or 320835 counting only the distinct ones).

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

The square root of 2566664 is about 1602.0811465091. The cubic root of 2566664 is about 136.9166737154.

The spelling of 2566664 in words is "two million, five hundred sixty-six thousand, six hundred sixty-four".