666586685666 has 8 divisors (see below), whose sum is σ = 1090778212944. Its totient is φ = 302993948020.

The previous prime is 666586685651. The next prime is 666586685669.

666586685666 is nontrivially palindromic in base 10.

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

It is a junction number, because it is equal to n+sod(n) for n = 666586685593 and 666586685602.

It is not an unprimeable number, because it can be changed into a prime (666586685669) 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 3 ways as a sum of consecutive naturals, for example, 15149697380 + ... + 15149697423.

It is an arithmetic number, because the mean of its divisors is an integer number (136347276618).

Almost surely, 2^666586685666 is an apocalyptic number.

666586685666 is a deficient number, since it is larger than the sum of its proper divisors (424191527278).

666586685666 is a wasteful number, since it uses less digits than its factorization.

666586685666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30299394816.

The product of its digits is 2687385600, while the sum is 74.

The spelling of 666586685666 in words is "six hundred sixty-six billion, five hundred eighty-six million, six hundred eighty-five thousand, six hundred sixty-six".