42208778317 has 2 divisors, whose sum is σ = 42208778318. Its totient is φ = 42208778316.

The previous prime is 42208778291. The next prime is 42208778327. The reversal of 42208778317 is 71387780224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39845748996 + 2363029321 = 199614^2 + 48611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42208778317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42208778327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21104389158 + 21104389159.

It is an arithmetic number, because the mean of its divisors is an integer number (21104389159).

Almost surely, 2^42208778317 is an apocalyptic number.

It is an amenable number.

42208778317 is a deficient number, since it is larger than the sum of its proper divisors (1).

42208778317 is an equidigital number, since it uses as much as digits as its factorization.

42208778317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1053696, while the sum is 49.

The spelling of 42208778317 in words is "forty-two billion, two hundred eight million, seven hundred seventy-eight thousand, three hundred seventeen".