823637352722 has 54 divisors (see below), whose sum is σ = 1294668576999. Its totient is φ = 392970395160.

The previous prime is 823637352721. The next prime is 823637352737. The reversal of 823637352722 is 227253736328.

It can be written as a sum of positive squares in only one way, i.e., 411818676361 + 411818676361 = 641731^2 + 641731^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=641731.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (823637352721) 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 26 ways as a sum of consecutive naturals, for example, 5052989813 + ... + 5052989975.

Almost surely, 2^823637352722 is an apocalyptic number.

823637352722 is a deficient number, since it is larger than the sum of its proper divisors (471031224277).

823637352722 is an equidigital number, since it uses as much as digits as its factorization.

823637352722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 323 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 50.

Multiplying 823637352722 by its sum of digits (50), we get a square (41181867636100 = 6417310²).

The spelling of 823637352722 in words is "eight hundred twenty-three billion, six hundred thirty-seven million, three hundred fifty-two thousand, seven hundred twenty-two".