665741189 has 2 divisors, whose sum is σ = 665741190. Its totient is φ = 665741188.

The previous prime is 665741159. The next prime is 665741201. The reversal of 665741189 is 981147566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 576816289 + 88924900 = 24017^2 + 9430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665741189 is a prime.

It is a super-2 number, since 2×665741189² = 886422661462267442, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665741159) 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, 332870594 + 332870595.

It is an arithmetic number, because the mean of its divisors is an integer number (332870595).

Almost surely, 2^665741189 is an apocalyptic number.

It is an amenable number.

665741189 is a deficient number, since it is larger than the sum of its proper divisors (1).

665741189 is an equidigital number, since it uses as much as digits as its factorization.

665741189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 665741189 is about 25801.9609526098. The cubic root of 665741189 is about 873.1760379295.

The spelling of 665741189 in words is "six hundred sixty-five million, seven hundred forty-one thousand, one hundred eighty-nine".