445445221423 has 2 divisors, whose sum is σ = 445445221424. Its totient is φ = 445445221422.

The previous prime is 445445221409. The next prime is 445445221457. The reversal of 445445221423 is 324122544544.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 445445221423 - 2¹⁷ = 445445090351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (445445221493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222722610711 + 222722610712.

It is an arithmetic number, because the mean of its divisors is an integer number (222722610712).

Almost surely, 2^445445221423 is an apocalyptic number.

445445221423 is a deficient number, since it is larger than the sum of its proper divisors (1).

445445221423 is an equidigital number, since it uses as much as digits as its factorization.

445445221423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 614400, while the sum is 40.

Adding to 445445221423 its reverse (324122544544), we get a palindrome (769567765967).

The spelling of 445445221423 in words is "four hundred forty-five billion, four hundred forty-five million, two hundred twenty-one thousand, four hundred twenty-three".