666563589 has 12 divisors (see below), whose sum is σ = 963237600. Its totient is φ = 444180264.

The previous prime is 666563587. The next prime is 666563593. The reversal of 666563589 is 985365666.

It is not a de Polignac number, because 666563589 - 2¹ = 666563587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666563587) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7072 + ... + 37190.

It is an arithmetic number, because the mean of its divisors is an integer number (80269800).

Almost surely, 2^666563589 is an apocalyptic number.

It is an amenable number.

666563589 is a deficient number, since it is larger than the sum of its proper divisors (296674011).

666563589 is a wasteful number, since it uses less digits than its factorization.

666563589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32584 (or 32581 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 54.

The square root of 666563589 is about 25817.8928071212. The cubic root of 666563589 is about 873.5354390977.

The spelling of 666563589 in words is "six hundred sixty-six million, five hundred sixty-three thousand, five hundred eighty-nine".