68685161 has 2 divisors, whose sum is σ = 68685162. Its totient is φ = 68685160.

The previous prime is 68685157. The next prime is 68685163. The reversal of 68685161 is 16158686.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52128400 + 16556761 = 7220^2 + 4069^2 .

It is a cyclic number.

It is not a de Polignac number, because 68685161 - 2² = 68685157 is a prime.

Together with 68685163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68685163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34342580 + 34342581.

It is an arithmetic number, because the mean of its divisors is an integer number (34342581).

Almost surely, 2^68685161 is an apocalyptic number.

It is an amenable number.

68685161 is a deficient number, since it is larger than the sum of its proper divisors (1).

68685161 is an equidigital number, since it uses as much as digits as its factorization.

68685161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 68685161 is about 8287.6511147610. The cubic root of 68685161 is about 409.5318094064.

The spelling of 68685161 in words is "sixty-eight million, six hundred eighty-five thousand, one hundred sixty-one".