168635767109 has 2 divisors, whose sum is σ = 168635767110. Its totient is φ = 168635767108.

The previous prime is 168635767099. The next prime is 168635767117. The reversal of 168635767109 is 901767536861.

168635767109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161641790209 + 6993976900 = 402047^2 + 83630^2 .

It is a cyclic number.

It is not a de Polignac number, because 168635767109 - 2⁴ = 168635767093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168635767159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84317883554 + 84317883555.

It is an arithmetic number, because the mean of its divisors is an integer number (84317883555).

Almost surely, 2^168635767109 is an apocalyptic number.

It is an amenable number.

168635767109 is a deficient number, since it is larger than the sum of its proper divisors (1).

168635767109 is an equidigital number, since it uses as much as digits as its factorization.

168635767109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11430720, while the sum is 59.

The spelling of 168635767109 in words is "one hundred sixty-eight billion, six hundred thirty-five million, seven hundred sixty-seven thousand, one hundred nine".