666595595666 has 64 divisors (see below), whose sum is σ = 1342770912000. Its totient is φ = 239688840960.

The previous prime is 666595595657. The next prime is 666595595681.

It is a happy number.

666595595666 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×666595595666³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 666595595593 and 666595595602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11480540 + ... + 11538456.

It is an arithmetic number, because the mean of its divisors is an integer number (20980795500).

Almost surely, 2^666595595666 is an apocalyptic number.

666595595666 is an abundant number, since it is smaller than the sum of its proper divisors (676175316334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666595595666 is a wasteful number, since it uses less digits than its factorization.

666595595666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63699.

The product of its digits is 2361960000, while the sum is 74.

The spelling of 666595595666 in words is "six hundred sixty-six billion, five hundred ninety-five million, five hundred ninety-five thousand, six hundred sixty-six".