66532189 has 2 divisors, whose sum is σ = 66532190. Its totient is φ = 66532188.

The previous prime is 66532187. The next prime is 66532201. The reversal of 66532189 is 98123566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34609689 + 31922500 = 5883^2 + 5650^2 .

It is a cyclic number.

It is not a de Polignac number, because 66532189 - 2¹ = 66532187 is a prime.

Together with 66532187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66532181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33266094 + 33266095.

It is an arithmetic number, because the mean of its divisors is an integer number (33266095).

Almost surely, 2^66532189 is an apocalyptic number.

It is an amenable number.

66532189 is a deficient number, since it is larger than the sum of its proper divisors (1).

66532189 is an equidigital number, since it uses as much as digits as its factorization.

66532189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 66532189 is about 8156.7266105957. The cubic root of 66532189 is about 405.2073094016.

The spelling of 66532189 in words is "sixty-six million, five hundred thirty-two thousand, one hundred eighty-nine".