442163747665 has 4 divisors (see below), whose sum is σ = 530596497204. Its totient is φ = 353730998128.

The previous prime is 442163747659. The next prime is 442163747693. The reversal of 442163747665 is 566747361244.

It is a happy number.

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 82212945984 + 359950801681 = 286728^2 + 599959^2 .

It is a cyclic number.

It is not a de Polignac number, because 442163747665 - 2⁵ = 442163747633 is a prime.

It is a Duffinian 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, 44216374762 + ... + 44216374771.

It is an arithmetic number, because the mean of its divisors is an integer number (132649124301).

Almost surely, 2^442163747665 is an apocalyptic number.

It is an amenable number.

442163747665 is a deficient number, since it is larger than the sum of its proper divisors (88432749539).

442163747665 is an equidigital number, since it uses as much as digits as its factorization.

442163747665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88432749538.

The product of its digits is 20321280, while the sum is 55.

The spelling of 442163747665 in words is "four hundred forty-two billion, one hundred sixty-three million, seven hundred forty-seven thousand, six hundred sixty-five".