8109566503 has 4 divisors (see below), whose sum is σ = 8128295728. Its totient is φ = 8090837280.

The previous prime is 8109566477. The next prime is 8109566533. The reversal of 8109566503 is 3056659018.

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 8109566503 - 2⁵ = 8109566471 is a prime.

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 8109566503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8109566533) 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, 9363963 + ... + 9364828.

It is an arithmetic number, because the mean of its divisors is an integer number (2032073932).

Almost surely, 2^8109566503 is an apocalyptic number.

8109566503 is a deficient number, since it is larger than the sum of its proper divisors (18729225).

8109566503 is a wasteful number, since it uses less digits than its factorization.

8109566503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18729224.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 8109566503 is about 90053.1315557655. The cubic root of 8109566503 is about 2009.0891728118.

The spelling of 8109566503 in words is "eight billion, one hundred nine million, five hundred sixty-six thousand, five hundred three".