42118207609 has 4 divisors (see below), whose sum is σ = 42121388404. Its totient is φ = 42115026816.

The previous prime is 42118207601. The next prime is 42118207631. The reversal of 42118207609 is 90670281124.

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 3364348009 + 38753859600 = 58003^2 + 196860^2 .

It is a cyclic number.

It is not a de Polignac number, because 42118207609 - 2³ = 42118207601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42118207601) 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, 1570452 + ... + 1597045.

It is an arithmetic number, because the mean of its divisors is an integer number (10530347101).

Almost surely, 2^42118207609 is an apocalyptic number.

It is an amenable number.

42118207609 is a deficient number, since it is larger than the sum of its proper divisors (3180795).

42118207609 is a wasteful number, since it uses less digits than its factorization.

42118207609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3180794.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 42118207609 in words is "forty-two billion, one hundred eighteen million, two hundred seven thousand, six hundred nine".