444420320545 has 4 divisors (see below), whose sum is σ = 533304384660. Its totient is φ = 355536256432.

The previous prime is 444420320521. The next prime is 444420320567. The reversal of 444420320545 is 545023024444.

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 211490534161 + 232929786384 = 459881^2 + 482628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-444420320545 is a prime.

It is a super-3 number, since 3×444420320545³ (a number of 36 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44442032050 + ... + 44442032059.

It is an arithmetic number, because the mean of its divisors is an integer number (133326096165).

Almost surely, 2^444420320545 is an apocalyptic number.

It is an amenable number.

444420320545 is a deficient number, since it is larger than the sum of its proper divisors (88884064115).

444420320545 is an equidigital number, since it uses as much as digits as its factorization.

444420320545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88884064114.

The product of its (nonzero) digits is 307200, while the sum is 37.

Adding to 444420320545 its reverse (545023024444), we get a palindrome (989443344989).

The spelling of 444420320545 in words is "four hundred forty-four billion, four hundred twenty million, three hundred twenty thousand, five hundred forty-five".