166597559 has 2 divisors, whose sum is σ = 166597560. Its totient is φ = 166597558.

The previous prime is 166597549. The next prime is 166597583. The reversal of 166597559 is 955795661.

It is a weak prime.

It is an emirp because it is prime and its reverse (955795661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166597559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166597559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166597549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83298779 + 83298780.

It is an arithmetic number, because the mean of its divisors is an integer number (83298780).

Almost surely, 2^166597559 is an apocalyptic number.

166597559 is a deficient number, since it is larger than the sum of its proper divisors (1).

166597559 is an equidigital number, since it uses as much as digits as its factorization.

166597559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2551500, while the sum is 53.

The square root of 166597559 is about 12907.2676814266. The cubic root of 166597559 is about 550.2451348044.

The spelling of 166597559 in words is "one hundred sixty-six million, five hundred ninety-seven thousand, five hundred fifty-nine".