8516738721 has 8 divisors (see below), whose sum is σ = 11360014560. Its totient is φ = 5675644352.

The previous prime is 8516738719. The next prime is 8516738749. The reversal of 8516738721 is 1278376158.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8516738721 - 2¹ = 8516738719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8516738521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536235 + ... + 551888.

It is an arithmetic number, because the mean of its divisors is an integer number (1420001820).

Almost surely, 2^8516738721 is an apocalyptic number.

It is an amenable number.

8516738721 is a deficient number, since it is larger than the sum of its proper divisors (2843275839).

8516738721 is a wasteful number, since it uses less digits than its factorization.

8516738721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090735.

The product of its digits is 564480, while the sum is 48.

The square root of 8516738721 is about 92286.1783854982. The cubic root of 8516738721 is about 2042.1663134532.

The spelling of 8516738721 in words is "eight billion, five hundred sixteen million, seven hundred thirty-eight thousand, seven hundred twenty-one".