68505539 has 2 divisors, whose sum is σ = 68505540. Its totient is φ = 68505538.

The previous prime is 68505509. The next prime is 68505589. The reversal of 68505539 is 93550586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68505539 - 2¹⁶ = 68440003 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68505496 and 68505505.

It is not a weakly prime, because it can be changed into another prime (68505509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34252769 + 34252770.

It is an arithmetic number, because the mean of its divisors is an integer number (34252770).

Almost surely, 2^68505539 is an apocalyptic number.

68505539 is a deficient number, since it is larger than the sum of its proper divisors (1).

68505539 is an equidigital number, since it uses as much as digits as its factorization.

68505539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 68505539 is about 8276.8072950867. The cubic root of 68505539 is about 409.1745020482.

The spelling of 68505539 in words is "sixty-eight million, five hundred five thousand, five hundred thirty-nine".