666586913 has 4 divisors (see below), whose sum is σ = 669121728. Its totient is φ = 664052100.

The previous prime is 666586891. The next prime is 666586919. The reversal of 666586913 is 319685666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666586913 - 2¹² = 666582817 is a prime.

It is a super-2 number, since 2×666586913² = 888676225165739138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666586919) 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 in 3 ways as a sum of consecutive naturals, for example, 1267013 + ... + 1267538.

It is an arithmetic number, because the mean of its divisors is an integer number (167280432).

Almost surely, 2^666586913 is an apocalyptic number.

It is an amenable number.

666586913 is a deficient number, since it is larger than the sum of its proper divisors (2534815).

666586913 is a wasteful number, since it uses less digits than its factorization.

666586913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2534814.

The product of its digits is 1399680, while the sum is 50.

The square root of 666586913 is about 25818.3445054093. The cubic root of 666586913 is about 873.5456277245.

The spelling of 666586913 in words is "six hundred sixty-six million, five hundred eighty-six thousand, nine hundred thirteen".