444571521661 has 4 divisors (see below), whose sum is σ = 444582954400. Its totient is φ = 444560088924.

The previous prime is 444571521649. The next prime is 444571521733. The reversal of 444571521661 is 166125175444.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 444571521661 - 2¹⁷ = 444571390589 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 (444571521061) 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 3 ways as a sum of consecutive naturals, for example, 5657841 + ... + 5735878.

It is an arithmetic number, because the mean of its divisors is an integer number (111145738600).

Almost surely, 2^444571521661 is an apocalyptic number.

It is an amenable number.

444571521661 is a deficient number, since it is larger than the sum of its proper divisors (11432739).

444571521661 is a wasteful number, since it uses less digits than its factorization.

444571521661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11432738.

The product of its digits is 806400, while the sum is 46.

The spelling of 444571521661 in words is "four hundred forty-four billion, five hundred seventy-one million, five hundred twenty-one thousand, six hundred sixty-one".