8664640621 has 32 divisors (see below), whose sum is σ = 10819807488. Its totient is φ = 6756134400.

The previous prime is 8664640609. The next prime is 8664640637. The reversal of 8664640621 is 1260464668.

8664640621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 8664640621 - 2¹⁹ = 8664116333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8664640601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2084281 + ... + 2088433.

It is an arithmetic number, because the mean of its divisors is an integer number (338118984).

Almost surely, 2^8664640621 is an apocalyptic number.

It is an amenable number.

8664640621 is a deficient number, since it is larger than the sum of its proper divisors (2155166867).

8664640621 is a wasteful number, since it uses less digits than its factorization.

8664640621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4501.

The product of its (nonzero) digits is 331776, while the sum is 43.

The square root of 8664640621 is about 93084.0513783108. The cubic root of 8664640621 is about 2053.9199729296.

The spelling of 8664640621 in words is "eight billion, six hundred sixty-four million, six hundred forty thousand, six hundred twenty-one".