666956659666 has 8 divisors (see below), whose sum is σ = 1091383624944. Its totient is φ = 303162118020.

The previous prime is 666956659661. The next prime is 666956659687.

666956659666 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 = 666956659592 and 666956659601.

It is not an unprimeable number, because it can be changed into a prime (666956659661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15158105880 + ... + 15158105923.

It is an arithmetic number, because the mean of its divisors is an integer number (136422953118).

Almost surely, 2^666956659666 is an apocalyptic number.

666956659666 is a deficient number, since it is larger than the sum of its proper divisors (424426965278).

666956659666 is a wasteful number, since it uses less digits than its factorization.

666956659666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30316211816.

The product of its digits is 3401222400, while the sum is 76.

The spelling of 666956659666 in words is "six hundred sixty-six billion, nine hundred fifty-six million, six hundred fifty-nine thousand, six hundred sixty-six".