2581650563 has 4 divisors (see below), whose sum is σ = 2592363048. Its totient is φ = 2570938080.

The previous prime is 2581650553. The next prime is 2581650587. The reversal of 2581650563 is 3650561852.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2581650563 - 2¹⁴ = 2581634179 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2581650563.

It is not an unprimeable number, because it can be changed into a prime (2581650553) 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, 5355881 + ... + 5356362.

It is an arithmetic number, because the mean of its divisors is an integer number (648090762).

Almost surely, 2^2581650563 is an apocalyptic number.

2581650563 is a deficient number, since it is larger than the sum of its proper divisors (10712485).

2581650563 is a wasteful number, since it uses less digits than its factorization.

2581650563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10712484.

The product of its (nonzero) digits is 216000, while the sum is 41.

The square root of 2581650563 is about 50809.9455126651. The cubic root of 2581650563 is about 1371.8263887612.

The spelling of 2581650563 in words is "two billion, five hundred eighty-one million, six hundred fifty thousand, five hundred sixty-three".