68168217757 has 2 divisors, whose sum is σ = 68168217758. Its totient is φ = 68168217756.

The previous prime is 68168217701. The next prime is 68168217763. The reversal of 68168217757 is 75771286186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62409532761 + 5758684996 = 249819^2 + 75886^2 .

It is a cyclic number.

It is not a de Polignac number, because 68168217757 - 2⁷ = 68168217629 is a prime.

It is a super-2 number, since 2×68168217757² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68168217457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34084108878 + 34084108879.

It is an arithmetic number, because the mean of its divisors is an integer number (34084108879).

Almost surely, 2^68168217757 is an apocalyptic number.

It is an amenable number.

68168217757 is a deficient number, since it is larger than the sum of its proper divisors (1).

68168217757 is an equidigital number, since it uses as much as digits as its factorization.

68168217757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7902720, while the sum is 58.

The spelling of 68168217757 in words is "sixty-eight billion, one hundred sixty-eight million, two hundred seventeen thousand, seven hundred fifty-seven".