447722978765 has 4 divisors (see below), whose sum is σ = 537267574524. Its totient is φ = 358178383008.

The previous prime is 447722978749. The next prime is 447722978797. The reversal of 447722978765 is 567879227744.

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 82207211524 + 365515767241 = 286718^2 + 604579^2 .

It is a cyclic number.

It is not a de Polignac number, because 447722978765 - 2⁴ = 447722978749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 447722978695 and 447722978704.

It is a congruent number.

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, 44772297872 + ... + 44772297881.

It is an arithmetic number, because the mean of its divisors is an integer number (134316893631).

Almost surely, 2^447722978765 is an apocalyptic number.

It is an amenable number.

447722978765 is a deficient number, since it is larger than the sum of its proper divisors (89544595759).

447722978765 is an equidigital number, since it uses as much as digits as its factorization.

447722978765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89544595758.

The product of its digits is 331914240, while the sum is 68.

The spelling of 447722978765 in words is "four hundred forty-seven billion, seven hundred twenty-two million, nine hundred seventy-eight thousand, seven hundred sixty-five".