442165105536521 has 4 divisors (see below), whose sum is σ = 442225817490192. Its totient is φ = 442104393582852.

The previous prime is 442165105536383. The next prime is 442165105536529. The reversal of 442165105536521 is 125635501561244.

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 not a de Polignac number, because 442165105536521 - 2¹⁸ = 442165105274377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 442165105536521.

It is not an unprimeable number, because it can be changed into a prime (442165105536529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30355965911 + ... + 30355980476.

It is an arithmetic number, because the mean of its divisors is an integer number (110556454372548).

Almost surely, 2^{442165105536521} is an apocalyptic number.

It is an amenable number.

442165105536521 is a deficient number, since it is larger than the sum of its proper divisors (60711953671).

442165105536521 is an equidigital number, since it uses as much as digits as its factorization.

442165105536521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60711953670.

The product of its (nonzero) digits is 4320000, while the sum is 50.

The spelling of 442165105536521 in words is "four hundred forty-two trillion, one hundred sixty-five billion, one hundred five million, five hundred thirty-six thousand, five hundred twenty-one".