623044323721 has 6 divisors (see below), whose sum is σ = 643790857866. Its totient is φ = 602946118800.

The previous prime is 623044323703. The next prime is 623044323761. The reversal of 623044323721 is 127323440326.

It can be written as a sum of positive squares in only one way, i.e., 608095838025 + 14948485696 = 779805^2 + 122264^2 .

It is not a de Polignac number, because 623044323721 - 2¹³ = 623044315529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623044323761) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 324163620 + ... + 324165541.

It is an arithmetic number, because the mean of its divisors is an integer number (107298476311).

Almost surely, 2^623044323721 is an apocalyptic number.

It is an amenable number.

623044323721 is a deficient number, since it is larger than the sum of its proper divisors (20746534145).

623044323721 is an equidigital number, since it uses as much as digits as its factorization.

623044323721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648329223 (or 648329192 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 37.

The spelling of 623044323721 in words is "six hundred twenty-three billion, forty-four million, three hundred twenty-three thousand, seven hundred twenty-one".