42205323917 has 2 divisors, whose sum is σ = 42205323918. Its totient is φ = 42205323916.

The previous prime is 42205323877. The next prime is 42205323967. The reversal of 42205323917 is 71932350224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30853273801 + 11352050116 = 175651^2 + 106546^2 .

It is a cyclic number.

It is not a de Polignac number, because 42205323917 - 2⁸ = 42205323661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42205323967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21102661958 + 21102661959.

It is an arithmetic number, because the mean of its divisors is an integer number (21102661959).

Almost surely, 2^42205323917 is an apocalyptic number.

It is an amenable number.

42205323917 is a deficient number, since it is larger than the sum of its proper divisors (1).

42205323917 is an equidigital number, since it uses as much as digits as its factorization.

42205323917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 42205323917 in words is "forty-two billion, two hundred five million, three hundred twenty-three thousand, nine hundred seventeen".