2566663 has 8 divisors (see below), whose sum is σ = 2812176. Its totient is φ = 2323200.

The previous prime is 2566661. The next prime is 2566667. The reversal of 2566663 is 3666652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2566663 - 2¹ = 2566661 is a prime.

It is a Duffinian number.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 3553 + ... + 4213.

It is an arithmetic number, because the mean of its divisors is an integer number (351522).

2^2566663 is an apocalyptic number.

2566663 is a deficient number, since it is larger than the sum of its proper divisors (245513).

2566663 is a wasteful number, since it uses less digits than its factorization.

2566663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025.

The product of its digits is 38880, while the sum is 34.

The square root of 2566663 is about 1602.0808344150. The cubic root of 2566663 is about 136.9166559340.

It can be divided in two parts, 2 and 566663, that added together give a palindrome (566665).

The spelling of 2566663 in words is "two million, five hundred sixty-six thousand, six hundred sixty-three".