42142605709 has 2 divisors, whose sum is σ = 42142605710. Its totient is φ = 42142605708.

The previous prime is 42142605697. The next prime is 42142605731. The reversal of 42142605709 is 90750624124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23569004484 + 18573601225 = 153522^2 + 136285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42142605709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42142605409) 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 as a sum of consecutive naturals, namely, 21071302854 + 21071302855.

It is an arithmetic number, because the mean of its divisors is an integer number (21071302855).

Almost surely, 2^42142605709 is an apocalyptic number.

It is an amenable number.

42142605709 is a deficient number, since it is larger than the sum of its proper divisors (1).

42142605709 is an equidigital number, since it uses as much as digits as its factorization.

42142605709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 42142605709 in words is "forty-two billion, one hundred forty-two million, six hundred five thousand, seven hundred nine".