822721215752 has 12 divisors (see below), whose sum is σ = 1542607089855. Its totient is φ = 411359325128.

The previous prime is 822721215751. The next prime is 822721215763. The reversal of 822721215752 is 257512127228.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 411360607876 + 411360607876 = 641374^2 + 641374^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=641374.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (822721215751) 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 2 ways as a sum of consecutive naturals, for example, 2405153 + ... + 2725839.

Almost surely, 2^822721215752 is an apocalyptic number.

It is an amenable number.

822721215752 is a deficient number, since it is larger than the sum of its proper divisors (719885874103).

822721215752 is an frugal number, since it uses more digits than its factorization.

822721215752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641380 (or 320689 counting only the distinct ones).

The product of its digits is 313600, while the sum is 44.

The spelling of 822721215752 in words is "eight hundred twenty-two billion, seven hundred twenty-one million, two hundred fifteen thousand, seven hundred fifty-two".