68679472109 has 2 divisors, whose sum is σ = 68679472110. Its totient is φ = 68679472108.

The previous prime is 68679472087. The next prime is 68679472123. The reversal of 68679472109 is 90127497686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68617802500 + 61669609 = 261950^2 + 7853^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68679472109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68679472129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34339736054 + 34339736055.

It is an arithmetic number, because the mean of its divisors is an integer number (34339736055).

Almost surely, 2^68679472109 is an apocalyptic number.

It is an amenable number.

68679472109 is a deficient number, since it is larger than the sum of its proper divisors (1).

68679472109 is an equidigital number, since it uses as much as digits as its factorization.

68679472109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9144576, while the sum is 59.

The spelling of 68679472109 in words is "sixty-eight billion, six hundred seventy-nine million, four hundred seventy-two thousand, one hundred nine".