445171213561 has 2 divisors, whose sum is σ = 445171213562. Its totient is φ = 445171213560.

The previous prime is 445171213559. The next prime is 445171213601. The reversal of 445171213561 is 165312171544.

It is an a-pointer prime, because the next prime (445171213601) can be obtained adding 445171213561 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254939157225 + 190232056336 = 504915^2 + 436156^2 .

It is a cyclic number.

It is not a de Polignac number, because 445171213561 - 2¹ = 445171213559 is a prime.

Together with 445171213559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (445171213061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222585606780 + 222585606781.

It is an arithmetic number, because the mean of its divisors is an integer number (222585606781).

Almost surely, 2^445171213561 is an apocalyptic number.

It is an amenable number.

445171213561 is a deficient number, since it is larger than the sum of its proper divisors (1).

445171213561 is an equidigital number, since it uses as much as digits as its factorization.

445171213561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 40.

The spelling of 445171213561 in words is "four hundred forty-five billion, one hundred seventy-one million, two hundred thirteen thousand, five hundred sixty-one".