11781120856 has 32 divisors (see below), whose sum is σ = 22211409600. Its totient is φ = 5858123040.

The previous prime is 11781120839. The next prime is 11781120877. The reversal of 11781120856 is 65802118711.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3676551 + ... + 3679753.

It is an arithmetic number, because the mean of its divisors is an integer number (694106550).

Almost surely, 2^11781120856 is an apocalyptic number.

It is an amenable number.

11781120856 is a deficient number, since it is larger than the sum of its proper divisors (10430288744).

11781120856 is a wasteful number, since it uses less digits than its factorization.

11781120856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5599 (or 5595 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 40.

The spelling of 11781120856 in words is "eleven billion, seven hundred eighty-one million, one hundred twenty thousand, eight hundred fifty-six".