68158217 has 2 divisors, whose sum is σ = 68158218. Its totient is φ = 68158216.

The previous prime is 68158213. The next prime is 68158241. The reversal of 68158217 is 71285186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59043856 + 9114361 = 7684^2 + 3019^2 .

It is a cyclic number.

It is not a de Polignac number, because 68158217 - 2² = 68158213 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68158213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34079108 + 34079109.

It is an arithmetic number, because the mean of its divisors is an integer number (34079109).

Almost surely, 2^68158217 is an apocalyptic number.

It is an amenable number.

68158217 is a deficient number, since it is larger than the sum of its proper divisors (1).

68158217 is an equidigital number, since it uses as much as digits as its factorization.

68158217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 38.

The square root of 68158217 is about 8255.7989922236. The cubic root of 68158217 is about 408.4818273565.

The spelling of 68158217 in words is "sixty-eight million, one hundred fifty-eight thousand, two hundred seventeen".