2665544563 has 16 divisors (see below), whose sum is σ = 3099340800. Its totient is φ = 2265552000.

The previous prime is 2665544507. The next prime is 2665544617. The reversal of 2665544563 is 3654455662.

It is a cyclic number.

It is not a de Polignac number, because 2665544563 - 2⁹ = 2665544051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2665544503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18963 + ... + 75436.

It is an arithmetic number, because the mean of its divisors is an integer number (193708800).

Almost surely, 2^2665544563 is an apocalyptic number.

2665544563 is a deficient number, since it is larger than the sum of its proper divisors (433796237).

2665544563 is a wasteful number, since it uses less digits than its factorization.

2665544563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94578.

The product of its digits is 2592000, while the sum is 46.

The square root of 2665544563 is about 51628.9120842189. The cubic root of 2665544563 is about 1386.5280156059.

The spelling of 2665544563 in words is "two billion, six hundred sixty-five million, five hundred forty-four thousand, five hundred sixty-three".