42018443509 has 4 divisors (see below), whose sum is σ = 48021078304. Its totient is φ = 36015808716.

The previous prime is 42018443483. The next prime is 42018443521. The reversal of 42018443509 is 90534481024.

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 42018443509 - 2⁷ = 42018443381 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 (42018443569) 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, 3001317387 + ... + 3001317400.

It is an arithmetic number, because the mean of its divisors is an integer number (12005269576).

Almost surely, 2^42018443509 is an apocalyptic number.

It is an amenable number.

42018443509 is a deficient number, since it is larger than the sum of its proper divisors (6002634795).

42018443509 is an equidigital number, since it uses as much as digits as its factorization.

42018443509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6002634794.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 42018443509 in words is "forty-two billion, eighteen million, four hundred forty-three thousand, five hundred nine".