11684721656 has 96 divisors (see below), whose sum is σ = 24124534560. Its totient is φ = 5286739968.

The previous prime is 11684721649. The next prime is 11684721661. The reversal of 11684721656 is 65612748611.

It is a self number, because there is not a number n which added to its sum of digits gives 11684721656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18059525 + ... + 18060171.

It is an arithmetic number, because the mean of its divisors is an integer number (251297235).

Almost surely, 2^11684721656 is an apocalyptic number.

It is an amenable number.

11684721656 is an abundant number, since it is smaller than the sum of its proper divisors (12439812904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11684721656 is a wasteful number, since it uses less digits than its factorization.

11684721656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841 (or 800 counting only the distinct ones).

The product of its digits is 483840, while the sum is 47.

The spelling of 11684721656 in words is "eleven billion, six hundred eighty-four million, seven hundred twenty-one thousand, six hundred fifty-six".