68166647 has 2 divisors, whose sum is σ = 68166648. Its totient is φ = 68166646.

The previous prime is 68166643. The next prime is 68166649. The reversal of 68166647 is 74666186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68166647 - 2² = 68166643 is a prime.

Together with 68166649, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 68166598 and 68166607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68166643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34083323 + 34083324.

It is an arithmetic number, because the mean of its divisors is an integer number (34083324).

Almost surely, 2^68166647 is an apocalyptic number.

68166647 is a deficient number, since it is larger than the sum of its proper divisors (1).

68166647 is an equidigital number, since it uses as much as digits as its factorization.

68166647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 44.

The square root of 68166647 is about 8256.3095266590. The cubic root of 68166647 is about 408.4986673894.

The spelling of 68166647 in words is "sixty-eight million, one hundred sixty-six thousand, six hundred forty-seven".