444261341311621 has 4 divisors (see below), whose sum is σ = 444290232615372. Its totient is φ = 444232450007872.

The previous prime is 444261341311603. The next prime is 444261341311651. The reversal of 444261341311621 is 126113143162444.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 322450078041025 + 121811263270596 = 17956895^2 + 11036814^2 .

It is a cyclic number.

It is not a de Polignac number, because 444261341311621 - 2³⁵ = 444226981573253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444261341311651) 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, 14445628810 + ... + 14445659563.

It is an arithmetic number, because the mean of its divisors is an integer number (111072558153843).

Almost surely, 2^{444261341311621} is an apocalyptic number.

It is an amenable number.

444261341311621 is a deficient number, since it is larger than the sum of its proper divisors (28891303751).

444261341311621 is a wasteful number, since it uses less digits than its factorization.

444261341311621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28891303750.

The product of its digits is 331776, while the sum is 43.

The spelling of 444261341311621 in words is "four hundred forty-four trillion, two hundred sixty-one billion, three hundred forty-one million, three hundred eleven thousand, six hundred twenty-one".