2663663 has 4 divisors (see below), whose sum is σ = 2673048. Its totient is φ = 2654280.

The previous prime is 2663651. The next prime is 2663669. The reversal of 2663663 is 3663662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3663662 = 2 ⋅1831831.

It is a cyclic number.

It is not a de Polignac number, because 2663663 - 2¹² = 2659567 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 (2663669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4253 + ... + 4838.

It is an arithmetic number, because the mean of its divisors is an integer number (668262).

2^2663663 is an apocalyptic number.

2663663 is a deficient number, since it is larger than the sum of its proper divisors (9385).

2663663 is an equidigital number, since it uses as much as digits as its factorization.

2663663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9384.

The product of its digits is 23328, while the sum is 32.

The square root of 2663663 is about 1632.0732213966. The cubic root of 2663663 is about 138.6201696557.

Subtracting 2663663 from its reverse (3663662), we obtain a palindrome (999999).

The spelling of 2663663 in words is "two million, six hundred sixty-three thousand, six hundred sixty-three".