11566047881 has 16 divisors (see below), whose sum is σ = 12198051840. Its totient is φ = 10945020240.

The previous prime is 11566047853. The next prime is 11566047917. The reversal of 11566047881 is 18874066511.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11566047881 - 2³⁰ = 10492306057 is a prime.

It is a super-2 number, since 2×11566047881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11566047281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3483140 + ... + 3486458.

It is an arithmetic number, because the mean of its divisors is an integer number (762378240).

Almost surely, 2^11566047881 is an apocalyptic number.

It is an amenable number.

11566047881 is a deficient number, since it is larger than the sum of its proper divisors (632003959).

11566047881 is a wasteful number, since it uses less digits than its factorization.

11566047881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4916.

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 11566047881 in words is "eleven billion, five hundred sixty-six million, forty-seven thousand, eight hundred eighty-one".