444642171546421 has 2 divisors, whose sum is σ = 444642171546422. Its totient is φ = 444642171546420.

The previous prime is 444642171546379. The next prime is 444642171546449. The reversal of 444642171546421 is 124645171246444.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403366493648196 + 41275677898225 = 20083986^2 + 6424615^2 .

It is a cyclic number.

It is not a de Polignac number, because 444642171546421 - 2³³ = 444633581611829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (444642171546481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222321085773210 + 222321085773211.

It is an arithmetic number, because the mean of its divisors is an integer number (222321085773211).

Almost surely, 2^{444642171546421} is an apocalyptic number.

It is an amenable number.

444642171546421 is a deficient number, since it is larger than the sum of its proper divisors (1).

444642171546421 is an equidigital number, since it uses as much as digits as its factorization.

444642171546421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20643840, while the sum is 55.

The spelling of 444642171546421 in words is "four hundred forty-four trillion, six hundred forty-two billion, one hundred seventy-one million, five hundred forty-six thousand, four hundred twenty-one".