68668543 has 2 divisors, whose sum is σ = 68668544. Its totient is φ = 68668542.

The previous prime is 68668541. The next prime is 68668571. The reversal of 68668543 is 34586686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68668543 - 2¹ = 68668541 is a prime.

Together with 68668541, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 68668493 and 68668502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68668541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34334271 + 34334272.

It is an arithmetic number, because the mean of its divisors is an integer number (34334272).

Almost surely, 2^68668543 is an apocalyptic number.

68668543 is a deficient number, since it is larger than the sum of its proper divisors (1).

68668543 is an equidigital number, since it uses as much as digits as its factorization.

68668543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 46.

The square root of 68668543 is about 8286.6484781243. The cubic root of 68668543 is about 409.4987787467.

The spelling of 68668543 in words is "sixty-eight million, six hundred sixty-eight thousand, five hundred forty-three".