11681784856 has 16 divisors (see below), whose sum is σ = 25032396240. Its totient is φ = 5006479200.

The previous prime is 11681784853. The next prime is 11681784859. The reversal of 11681784856 is 65848718611.

It is an interprime number because it is at equal distance from previous prime (11681784853) and next prime (11681784859).

It is a junction number, because it is equal to n+sod(n) for n = 11681784797 and 11681784806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11681784853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104301595 + ... + 104301706.

It is an arithmetic number, because the mean of its divisors is an integer number (1564524765).

Almost surely, 2^11681784856 is an apocalyptic number.

It is an amenable number.

11681784856 is an abundant number, since it is smaller than the sum of its proper divisors (13350611384).

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

11681784856 is a wasteful number, since it uses less digits than its factorization.

11681784856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208603314 (or 208603310 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 55.

The spelling of 11681784856 in words is "eleven billion, six hundred eighty-one million, seven hundred eighty-four thousand, eight hundred fifty-six".