68117779 has 2 divisors, whose sum is σ = 68117780. Its totient is φ = 68117778.

The previous prime is 68117771. The next prime is 68117813. The reversal of 68117779 is 97771186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68117779 - 2³ = 68117771 is a prime.

It is not a weakly prime, because it can be changed into another prime (68117771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34058889 + 34058890.

It is an arithmetic number, because the mean of its divisors is an integer number (34058890).

Almost surely, 2^68117779 is an apocalyptic number.

68117779 is a deficient number, since it is larger than the sum of its proper divisors (1).

68117779 is an equidigital number, since it uses as much as digits as its factorization.

68117779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176, while the sum is 46.

The square root of 68117779 is about 8253.3495624504. The cubic root of 68117779 is about 408.4010278254.

The spelling of 68117779 in words is "sixty-eight million, one hundred seventeen thousand, seven hundred seventy-nine".