444621661552721 has 16 divisors (see below), whose sum is σ = 450783834621120. Its totient is φ = 438478720861440.

The previous prime is 444621661552703. The next prime is 444621661552741. The reversal of 444621661552721 is 127255166126444.

It is a cyclic number.

It is not a de Polignac number, because 444621661552721 - 2³⁰ = 444620587810897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (444621661552741) 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 15 ways as a sum of consecutive naturals, for example, 1346222621 + ... + 1346552853.

It is an arithmetic number, because the mean of its divisors is an integer number (28173989663820).

Almost surely, 2^{444621661552721} is an apocalyptic number.

It is an amenable number.

444621661552721 is a deficient number, since it is larger than the sum of its proper divisors (6162173068399).

444621661552721 is a wasteful number, since it uses less digits than its factorization.

444621661552721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359296.

The product of its digits is 19353600, while the sum is 56.

The spelling of 444621661552721 in words is "four hundred forty-four trillion, six hundred twenty-one billion, six hundred sixty-one million, five hundred fifty-two thousand, seven hundred twenty-one".