168161606513 has 2 divisors, whose sum is σ = 168161606514. Its totient is φ = 168161606512.

The previous prime is 168161606507. The next prime is 168161606537. The reversal of 168161606513 is 315606161861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168155764624 + 5841889 = 410068^2 + 2417^2 .

It is a cyclic number.

It is not a de Polignac number, because 168161606513 - 2⁶ = 168161606449 is a prime.

It is not a weakly prime, because it can be changed into another prime (168161606563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84080803256 + 84080803257.

It is an arithmetic number, because the mean of its divisors is an integer number (84080803257).

Almost surely, 2^168161606513 is an apocalyptic number.

It is an amenable number.

168161606513 is a deficient number, since it is larger than the sum of its proper divisors (1).

168161606513 is an equidigital number, since it uses as much as digits as its factorization.

168161606513 is an evil number, because the sum of its binary digits is even.

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

The spelling of 168161606513 in words is "one hundred sixty-eight billion, one hundred sixty-one million, six hundred six thousand, five hundred thirteen".