68739855893789 has 2 divisors, whose sum is σ = 68739855893790. Its totient is φ = 68739855893788.

The previous prime is 68739855893773. The next prime is 68739855893791. The reversal of 68739855893789 is 98739855893786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62677574784889 + 6062281108900 = 7916917^2 + 2462170^2 .

It is a cyclic number.

It is not a de Polignac number, because 68739855893789 - 2⁴ = 68739855893773 is a prime.

Together with 68739855893791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68739855893729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34369927946894 + 34369927946895.

It is an arithmetic number, because the mean of its divisors is an integer number (34369927946895).

Almost surely, 2^{68739855893789} is an apocalyptic number.

It is an amenable number.

68739855893789 is a deficient number, since it is larger than the sum of its proper divisors (1).

68739855893789 is an equidigital number, since it uses as much as digits as its factorization.

68739855893789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 197522841600, while the sum is 95.

The spelling of 68739855893789 in words is "sixty-eight trillion, seven hundred thirty-nine billion, eight hundred fifty-five million, eight hundred ninety-three thousand, seven hundred eighty-nine".