166612613 has 2 divisors, whose sum is σ = 166612614. Its totient is φ = 166612612.

The previous prime is 166612583. The next prime is 166612619. The reversal of 166612613 is 316216661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165431044 + 1181569 = 12862^2 + 1087^2 .

It is an emirp because it is prime and its reverse (316216661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166612613 - 2⁸ = 166612357 is a prime.

It is equal to p_9324095 and since 166612613 and 9324095 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166612613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166612619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83306306 + 83306307.

It is an arithmetic number, because the mean of its divisors is an integer number (83306307).

Almost surely, 2^166612613 is an apocalyptic number.

It is an amenable number.

166612613 is a deficient number, since it is larger than the sum of its proper divisors (1).

166612613 is an equidigital number, since it uses as much as digits as its factorization.

166612613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 166612613 is about 12907.8508280813. The cubic root of 166612613 is about 550.2617079579.

The spelling of 166612613 in words is "one hundred sixty-six million, six hundred twelve thousand, six hundred thirteen".