11886591986 has 4 divisors (see below), whose sum is σ = 17829887982. Its totient is φ = 5943295992.

The previous prime is 11886591979. The next prime is 11886592021. The reversal of 11886591986 is 68919568811.

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., 6395040961 + 5491551025 = 79969^2 + 74105^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2971647995 + ... + 2971647998.

Almost surely, 2^11886591986 is an apocalyptic number.

11886591986 is a deficient number, since it is larger than the sum of its proper divisors (5943295996).

11886591986 is an equidigital number, since it uses as much as digits as its factorization.

11886591986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5943295995.

The product of its digits is 7464960, while the sum is 62.

The spelling of 11886591986 in words is "eleven billion, eight hundred eighty-six million, five hundred ninety-one thousand, nine hundred eighty-six".