11811512686 has 4 divisors (see below), whose sum is σ = 17717269032. Its totient is φ = 5905756342.

The previous prime is 11811512641. The next prime is 11811512717. The reversal of 11811512686 is 68621511811.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2952878170 + ... + 2952878173.

It is an arithmetic number, because the mean of its divisors is an integer number (4429317258).

Almost surely, 2^11811512686 is an apocalyptic number.

11811512686 is a deficient number, since it is larger than the sum of its proper divisors (5905756346).

11811512686 is an equidigital number, since it uses as much as digits as its factorization.

11811512686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5905756345.

The product of its digits is 23040, while the sum is 40.

The spelling of 11811512686 in words is "eleven billion, eight hundred eleven million, five hundred twelve thousand, six hundred eighty-six".