11722685818 has 16 divisors (see below), whose sum is σ = 18636359040. Its totient is φ = 5511231936.

The previous prime is 11722685813. The next prime is 11722685827. The reversal of 11722685818 is 81858622711.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (11722685813) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 130596 + ... + 201247.

It is an arithmetic number, because the mean of its divisors is an integer number (1164772440).

Almost surely, 2^11722685818 is an apocalyptic number.

11722685818 is a deficient number, since it is larger than the sum of its proper divisors (6913673222).

11722685818 is a wasteful number, since it uses less digits than its factorization.

11722685818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332901.

The product of its digits is 430080, while the sum is 49.

The spelling of 11722685818 in words is "eleven billion, seven hundred twenty-two million, six hundred eighty-five thousand, eight hundred eighteen".