166188959 has 2 divisors, whose sum is σ = 166188960. Its totient is φ = 166188958.

The previous prime is 166188947. The next prime is 166188983. The reversal of 166188959 is 959881661.

It is a weak prime.

It is an emirp because it is prime and its reverse (959881661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166188959 - 2⁴ = 166188943 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166188959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166188989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83094479 + 83094480.

It is an arithmetic number, because the mean of its divisors is an integer number (83094480).

Almost surely, 2^166188959 is an apocalyptic number.

166188959 is a deficient number, since it is larger than the sum of its proper divisors (1).

166188959 is an equidigital number, since it uses as much as digits as its factorization.

166188959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 53.

The square root of 166188959 is about 12891.4296724607. The cubic root of 166188959 is about 549.7949196838.

The spelling of 166188959 in words is "one hundred sixty-six million, one hundred eighty-eight thousand, nine hundred fifty-nine".