2566545643 has 16 divisors (see below), whose sum is σ = 2710112256. Its totient is φ = 2425746400.

The previous prime is 2566545587. The next prime is 2566545649. The reversal of 2566545643 is 3465456652.

It is a de Polignac number, because none of the positive numbers 2^k-2566545643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2566545593 and 2566545602.

It is not an unprimeable number, because it can be changed into a prime (2566545649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1725246 + ... + 1726732.

It is an arithmetic number, because the mean of its divisors is an integer number (169382016).

Almost surely, 2^2566545643 is an apocalyptic number.

2566545643 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2566545643 is a deficient number, since it is larger than the sum of its proper divisors (143566613).

2566545643 is a wasteful number, since it uses less digits than its factorization.

2566545643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2354.

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

The square root of 2566545643 is about 50661.0860819229. The cubic root of 2566545643 is about 1369.1456912937.

The spelling of 2566545643 in words is "two billion, five hundred sixty-six million, five hundred forty-five thousand, six hundred forty-three".