442640810009 has 4 divisors (see below), whose sum is σ = 442666802100. Its totient is φ = 442614817920.

The previous prime is 442640809993. The next prime is 442640810023. The reversal of 442640810009 is 900018046244.

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 210699360400 + 231941449609 = 459020^2 + 481603^2 .

It is a cyclic number.

It is not a de Polignac number, because 442640810009 - 2⁴ = 442640809993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442640810089) 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, 12970484 + ... + 13004565.

It is an arithmetic number, because the mean of its divisors is an integer number (110666700525).

Almost surely, 2^442640810009 is an apocalyptic number.

It is an amenable number.

442640810009 is a deficient number, since it is larger than the sum of its proper divisors (25992091).

442640810009 is a wasteful number, since it uses less digits than its factorization.

442640810009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25992090.

The product of its (nonzero) digits is 55296, while the sum is 38.

The spelling of 442640810009 in words is "four hundred forty-two billion, six hundred forty million, eight hundred ten thousand, nine".