8318554721 has 4 divisors (see below), whose sum is σ = 8337855744. Its totient is φ = 8299253700.

The previous prime is 8318554709. The next prime is 8318554747. The reversal of 8318554721 is 1274558138.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8318554721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8318574721) 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, 9649865 + ... + 9650726.

It is an arithmetic number, because the mean of its divisors is an integer number (2084463936).

Almost surely, 2^8318554721 is an apocalyptic number.

It is an amenable number.

8318554721 is a deficient number, since it is larger than the sum of its proper divisors (19301023).

8318554721 is a wasteful number, since it uses less digits than its factorization.

8318554721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19301022.

The product of its digits is 268800, while the sum is 44.

The square root of 8318554721 is about 91206.1112042389. Note that the first 3 decimals coincide. The cubic root of 8318554721 is about 2026.2014692744.

The spelling of 8318554721 in words is "eight billion, three hundred eighteen million, five hundred fifty-four thousand, seven hundred twenty-one".