68956168909 has 2 divisors, whose sum is σ = 68956168910. Its totient is φ = 68956168908.

The previous prime is 68956168901. The next prime is 68956168949. The reversal of 68956168909 is 90986165986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54264304809 + 14691864100 = 232947^2 + 121210^2 .

It is a cyclic number.

It is not a de Polignac number, because 68956168909 - 2³ = 68956168901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68956168901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34478084454 + 34478084455.

It is an arithmetic number, because the mean of its divisors is an integer number (34478084455).

Almost surely, 2^68956168909 is an apocalyptic number.

It is an amenable number.

68956168909 is a deficient number, since it is larger than the sum of its proper divisors (1).

68956168909 is an equidigital number, since it uses as much as digits as its factorization.

68956168909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50388480, while the sum is 67.

The spelling of 68956168909 in words is "sixty-eight billion, nine hundred fifty-six million, one hundred sixty-eight thousand, nine hundred nine".