11671665656666 has 4 divisors (see below), whose sum is σ = 17507498485002. Its totient is φ = 5835832828332.

The previous prime is 11671665656657. The next prime is 11671665656681. The reversal of 11671665656666 is 66665656617611.

11671665656666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10947925825225 + 723739831441 = 3308765^2 + 850729^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11671665656596 and 11671665656605.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2917916414165 + ... + 2917916414168.

Almost surely, 2^{11671665656666} is an apocalyptic number.

11671665656666 is a deficient number, since it is larger than the sum of its proper divisors (5835832828336).

11671665656666 is an equidigital number, since it uses as much as digits as its factorization.

11671665656666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5835832828335.

The product of its digits is 293932800, while the sum is 68.

The spelling of 11671665656666 in words is "eleven trillion, six hundred seventy-one billion, six hundred sixty-five million, six hundred fifty-six thousand, six hundred sixty-six".