42425105209 has 2 divisors, whose sum is σ = 42425105210. Its totient is φ = 42425105208.

The previous prime is 42425105207. The next prime is 42425105231. The reversal of 42425105209 is 90250152424.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39650765625 + 2774339584 = 199125^2 + 52672^2 .

It is a cyclic number.

It is not a de Polignac number, because 42425105209 - 2¹ = 42425105207 is a prime.

Together with 42425105207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42425105201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21212552604 + 21212552605.

It is an arithmetic number, because the mean of its divisors is an integer number (21212552605).

Almost surely, 2^42425105209 is an apocalyptic number.

It is an amenable number.

42425105209 is a deficient number, since it is larger than the sum of its proper divisors (1).

42425105209 is an equidigital number, since it uses as much as digits as its factorization.

42425105209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 42425105209 in words is "forty-two billion, four hundred twenty-five million, one hundred five thousand, two hundred nine".