166549589 has 2 divisors, whose sum is σ = 166549590. Its totient is φ = 166549588.

The previous prime is 166549583. The next prime is 166549699. The reversal of 166549589 is 985945661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162766564 + 3783025 = 12758^2 + 1945^2 .

It is an emirp because it is prime and its reverse (985945661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166549589 - 2²⁰ = 165501013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166549589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166549583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83274794 + 83274795.

It is an arithmetic number, because the mean of its divisors is an integer number (83274795).

Almost surely, 2^166549589 is an apocalyptic number.

It is an amenable number.

166549589 is a deficient number, since it is larger than the sum of its proper divisors (1).

166549589 is an equidigital number, since it uses as much as digits as its factorization.

166549589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2332800, while the sum is 53.

The square root of 166549589 is about 12905.4092922309. The cubic root of 166549589 is about 550.1923173180.

The spelling of 166549589 in words is "one hundred sixty-six million, five hundred forty-nine thousand, five hundred eighty-nine".