168106561613 has 2 divisors, whose sum is σ = 168106561614. Its totient is φ = 168106561612.

The previous prime is 168106561577. The next prime is 168106561669. The reversal of 168106561613 is 316165601861.

168106561613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157817096644 + 10289464969 = 397262^2 + 101437^2 .

It is a cyclic number.

It is not a de Polignac number, because 168106561613 - 2¹² = 168106557517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168106561213) 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, 84053280806 + 84053280807.

It is an arithmetic number, because the mean of its divisors is an integer number (84053280807).

Almost surely, 2^168106561613 is an apocalyptic number.

It is an amenable number.

168106561613 is a deficient number, since it is larger than the sum of its proper divisors (1).

168106561613 is an equidigital number, since it uses as much as digits as its factorization.

168106561613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 168106561613 in words is "one hundred sixty-eight billion, one hundred six million, five hundred sixty-one thousand, six hundred thirteen".