8320647553 has 4 divisors (see below), whose sum is σ = 8344489300. Its totient is φ = 8296805808.

The previous prime is 8320647551. The next prime is 8320647571. The reversal of 8320647553 is 3557460238.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4241526129 + 4079121424 = 65127^2 + 63868^2 .

It is a cyclic number.

It is not a de Polignac number, because 8320647553 - 2¹ = 8320647551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8320647551) 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 3 ways as a sum of consecutive naturals, for example, 11920350 + ... + 11921047.

It is an arithmetic number, because the mean of its divisors is an integer number (2086122325).

Almost surely, 2^8320647553 is an apocalyptic number.

It is an amenable number.

8320647553 is a deficient number, since it is larger than the sum of its proper divisors (23841747).

8320647553 is a wasteful number, since it uses less digits than its factorization.

8320647553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23841746.

The product of its (nonzero) digits is 604800, while the sum is 43.

The square root of 8320647553 is about 91217.5835735633. The cubic root of 8320647553 is about 2026.3713763416.

The spelling of 8320647553 in words is "eight billion, three hundred twenty million, six hundred forty-seven thousand, five hundred fifty-three".