666529689 has 16 divisors (see below), whose sum is σ = 1016094080. Its totient is φ = 380712960.

The previous prime is 666529681. The next prime is 666529723. The reversal of 666529689 is 986925666.

It is not a de Polignac number, because 666529689 - 2³ = 666529681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (666529681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59097 + ... + 69465.

It is an arithmetic number, because the mean of its divisors is an integer number (63505880).

Almost surely, 2^666529689 is an apocalyptic number.

It is an amenable number.

666529689 is a deficient number, since it is larger than the sum of its proper divisors (349564391).

666529689 is a wasteful number, since it uses less digits than its factorization.

666529689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13440.

The product of its digits is 8398080, while the sum is 57.

The square root of 666529689 is about 25817.2362773400. The cubic root of 666529689 is about 873.5206301313.

The spelling of 666529689 in words is "six hundred sixty-six million, five hundred twenty-nine thousand, six hundred eighty-nine".