2645563 has 4 divisors (see below), whose sum is σ = 2650168. Its totient is φ = 2640960.

The previous prime is 2645561. The next prime is 2645567. The reversal of 2645563 is 3655462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3655462 = 2 ⋅1827731.

It is a cyclic number.

It is not a de Polignac number, because 2645563 - 2¹ = 2645561 is a prime.

It is a d-powerful number, because it can be written as 2¹⁸ + 6 + 4³ + 5⁸ + 5⁸ + 6⁵ + 3¹³ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2645561) 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, 1293 + ... + 2638.

It is an arithmetic number, because the mean of its divisors is an integer number (662542).

2^2645563 is an apocalyptic number.

2645563 is a deficient number, since it is larger than the sum of its proper divisors (4605).

2645563 is an equidigital number, since it uses as much as digits as its factorization.

2645563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4604.

The product of its digits is 21600, while the sum is 31.

The square root of 2645563 is about 1626.5186749620. The cubic root of 2645563 is about 138.3054739787.

The spelling of 2645563 in words is "two million, six hundred forty-five thousand, five hundred sixty-three".