721325423444 has 12 divisors (see below), whose sum is σ = 1267737172884. Its totient is φ = 359114802624.

The previous prime is 721325423431. The next prime is 721325423447. The reversal of 721325423444 is 444324523127.

It can be written as a sum of positive squares in 2 ways, for example, as 371110019344 + 350215404100 = 609188^2 + 591790^2 .

It is a super-3 number, since 3×721325423444³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721325423447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386976227 + ... + 386978090.

It is an arithmetic number, because the mean of its divisors is an integer number (105644764407).

Almost surely, 2^721325423444 is an apocalyptic number.

It is an amenable number.

721325423444 is a deficient number, since it is larger than the sum of its proper divisors (546411749440).

721325423444 is a wasteful number, since it uses less digits than its factorization.

721325423444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773954554 (or 773954552 counting only the distinct ones).

The product of its digits is 645120, while the sum is 41.

The spelling of 721325423444 in words is "seven hundred twenty-one billion, three hundred twenty-five million, four hundred twenty-three thousand, four hundred forty-four".