8545816505 has 4 divisors (see below), whose sum is σ = 10254979812. Its totient is φ = 6836653200.

The previous prime is 8545816493. The next prime is 8545816511. The reversal of 8545816505 is 5056185458.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1951077241 + 6594739264 = 44171^2 + 81208^2 .

It is not a de Polignac number, because 8545816505 - 2⁶ = 8545816441 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 8545816505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854581646 + ... + 854581655.

It is an arithmetic number, because the mean of its divisors is an integer number (2563744953).

Almost surely, 2^8545816505 is an apocalyptic number.

It is an amenable number.

8545816505 is a deficient number, since it is larger than the sum of its proper divisors (1709163307).

8545816505 is a wasteful number, since it uses less digits than its factorization.

8545816505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709163306.

The product of its (nonzero) digits is 960000, while the sum is 47.

The square root of 8545816505 is about 92443.5855265253. The cubic root of 8545816505 is about 2044.4877896521.

The spelling of 8545816505 in words is "eight billion, five hundred forty-five million, eight hundred sixteen thousand, five hundred five".