42240565909 has 2 divisors, whose sum is σ = 42240565910. Its totient is φ = 42240565908.

The previous prime is 42240565891. The next prime is 42240565921. The reversal of 42240565909 is 90956504224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34584840900 + 7655725009 = 185970^2 + 87497^2 .

It is a cyclic number.

It is not a de Polignac number, because 42240565909 - 2¹³ = 42240557717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42240515909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21120282954 + 21120282955.

It is an arithmetic number, because the mean of its divisors is an integer number (21120282955).

Almost surely, 2^42240565909 is an apocalyptic number.

It is an amenable number.

42240565909 is a deficient number, since it is larger than the sum of its proper divisors (1).

42240565909 is an equidigital number, since it uses as much as digits as its factorization.

42240565909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 42240565909 in words is "forty-two billion, two hundred forty million, five hundred sixty-five thousand, nine hundred nine".