666585687 has 8 divisors (see below), whose sum is σ = 890407936. Its totient is φ = 443576952.

The previous prime is 666585679. The next prime is 666585697. The reversal of 666585687 is 786585666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666585687 - 2³ = 666585679 is a prime.

It is a super-2 number, since 2×666585687² = 888672956226523938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666585617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201463 + ... + 204744.

It is an arithmetic number, because the mean of its divisors is an integer number (111300992).

Almost surely, 2^666585687 is an apocalyptic number.

666585687 is a deficient number, since it is larger than the sum of its proper divisors (223822249).

666585687 is a wasteful number, since it uses less digits than its factorization.

666585687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406757.

The product of its digits is 14515200, while the sum is 57.

The square root of 666585687 is about 25818.3207625903. The cubic root of 666585687 is about 873.5450921766.

The spelling of 666585687 in words is "six hundred sixty-six million, five hundred eighty-five thousand, six hundred eighty-seven".