444499478509 has 4 divisors (see below), whose sum is σ = 463825542816. Its totient is φ = 425173414204.

The previous prime is 444499478459. The next prime is 444499478561. The reversal of 444499478509 is 905874994444.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-444499478509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444499478909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9663032119 + ... + 9663032164.

It is an arithmetic number, because the mean of its divisors is an integer number (115956385704).

Almost surely, 2^444499478509 is an apocalyptic number.

It is an amenable number.

444499478509 is a deficient number, since it is larger than the sum of its proper divisors (19326064307).

444499478509 is a wasteful number, since it uses less digits than its factorization.

444499478509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19326064306.

The product of its (nonzero) digits is 209018880, while the sum is 67.

The spelling of 444499478509 in words is "four hundred forty-four billion, four hundred ninety-nine million, four hundred seventy-eight thousand, five hundred nine".