8626646721 has 24 divisors (see below), whose sum is σ = 14449043392. Its totient is φ = 4481373600.

The previous prime is 8626646711. The next prime is 8626646747. The reversal of 8626646721 is 1276466268.

It is not a de Polignac number, because 8626646721 - 2¹¹ = 8626644673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8626646711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1694950 + ... + 1700031.

Almost surely, 2^8626646721 is an apocalyptic number.

It is an amenable number.

8626646721 is a deficient number, since it is larger than the sum of its proper divisors (5822396671).

8626646721 is a wasteful number, since it uses less digits than its factorization.

8626646721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3395013 (or 3395002 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 48.

The square root of 8626646721 is about 92879.7433297487. The cubic root of 8626646721 is about 2050.9134712271.

The spelling of 8626646721 in words is "eight billion, six hundred twenty-six million, six hundred forty-six thousand, seven hundred twenty-one".