8637522721 has 16 divisors (see below), whose sum is σ = 9191793600. Its totient is φ = 8093711808.

The previous prime is 8637522709. The next prime is 8637522739. The reversal of 8637522721 is 1272257368.

It is not a de Polignac number, because 8637522721 - 2²³ = 8629134113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8637522791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640870 + ... + 654208.

It is an arithmetic number, because the mean of its divisors is an integer number (574487100).

Almost surely, 2^8637522721 is an apocalyptic number.

It is an amenable number.

8637522721 is a deficient number, since it is larger than the sum of its proper divisors (554270879).

8637522721 is a wasteful number, since it uses less digits than its factorization.

8637522721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13728.

The product of its digits is 282240, while the sum is 43.

The square root of 8637522721 is about 92938.2737143315. The cubic root of 8637522721 is about 2051.7750021033.

The spelling of 8637522721 in words is "eight billion, six hundred thirty-seven million, five hundred twenty-two thousand, seven hundred twenty-one".