68840820239 has 4 divisors (see below), whose sum is σ = 68931282000. Its totient is φ = 68750358480.

The previous prime is 68840820149. The next prime is 68840820271. The reversal of 68840820239 is 93202804886.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68840820239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68840828239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45229739 + ... + 45231260.

It is an arithmetic number, because the mean of its divisors is an integer number (17232820500).

Almost surely, 2^68840820239 is an apocalyptic number.

68840820239 is a deficient number, since it is larger than the sum of its proper divisors (90461761).

68840820239 is an equidigital number, since it uses as much as digits as its factorization.

68840820239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90461760.

The product of its (nonzero) digits is 1327104, while the sum is 50.

The spelling of 68840820239 in words is "sixty-eight billion, eight hundred forty million, eight hundred twenty thousand, two hundred thirty-nine".