68778957302989 has 2 divisors, whose sum is σ = 68778957302990. Its totient is φ = 68778957302988.

The previous prime is 68778957302953. The next prime is 68778957303079. The reversal of 68778957302989 is 98920375987786.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67245198900489 + 1533758402500 = 8200317^2 + 1238450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68778957302989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68778957302089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34389478651494 + 34389478651495.

It is an arithmetic number, because the mean of its divisors is an integer number (34389478651495).

Almost surely, 2^{68778957302989} is an apocalyptic number.

It is an amenable number.

68778957302989 is a deficient number, since it is larger than the sum of its proper divisors (1).

68778957302989 is an equidigital number, since it uses as much as digits as its factorization.

68778957302989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23044331520, while the sum is 88.

The spelling of 68778957302989 in words is "sixty-eight trillion, seven hundred seventy-eight billion, nine hundred fifty-seven million, three hundred two thousand, nine hundred eighty-nine".