168780613 has 2 divisors, whose sum is σ = 168780614. Its totient is φ = 168780612.

The previous prime is 168780581. The next prime is 168780617. The reversal of 168780613 is 316087861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140232964 + 28547649 = 11842^2 + 5343^2 .

It is a cyclic number.

It is not a de Polignac number, because 168780613 - 2⁵ = 168780581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168780617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84390306 + 84390307.

It is an arithmetic number, because the mean of its divisors is an integer number (84390307).

Almost surely, 2^168780613 is an apocalyptic number.

It is an amenable number.

168780613 is a deficient number, since it is larger than the sum of its proper divisors (1).

168780613 is an equidigital number, since it uses as much as digits as its factorization.

168780613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 168780613 is about 12991.5592982521. The cubic root of 168780613 is about 552.6381388515.

The spelling of 168780613 in words is "one hundred sixty-eight million, seven hundred eighty thousand, six hundred thirteen".