68539643 has 2 divisors, whose sum is σ = 68539644. Its totient is φ = 68539642.

The previous prime is 68539621. The next prime is 68539663. The reversal of 68539643 is 34693586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68539643 - 2⁶ = 68539579 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 68539594 and 68539603.

It is not a weakly prime, because it can be changed into another prime (68539613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34269821 + 34269822.

It is an arithmetic number, because the mean of its divisors is an integer number (34269822).

Almost surely, 2^68539643 is an apocalyptic number.

68539643 is a deficient number, since it is larger than the sum of its proper divisors (1).

68539643 is an equidigital number, since it uses as much as digits as its factorization.

68539643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 44.

The square root of 68539643 is about 8278.8672534351. The cubic root of 68539643 is about 409.2423903407.

The spelling of 68539643 in words is "sixty-eight million, five hundred thirty-nine thousand, six hundred forty-three".