11678715866 has 4 divisors (see below), whose sum is σ = 17518073802. Its totient is φ = 5839357932.

The previous prime is 11678715859. The next prime is 11678715887. The reversal of 11678715866 is 66851787611.

It is a happy number.

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., 8432565241 + 3246150625 = 91829^2 + 56975^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2919678965 + ... + 2919678968.

Almost surely, 2^11678715866 is an apocalyptic number.

11678715866 is a deficient number, since it is larger than the sum of its proper divisors (5839357936).

11678715866 is an equidigital number, since it uses as much as digits as its factorization.

11678715866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5839357935.

The product of its digits is 3386880, while the sum is 56.

The spelling of 11678715866 in words is "eleven billion, six hundred seventy-eight million, seven hundred fifteen thousand, eight hundred sixty-six".