11881812156 has 48 divisors (see below), whose sum is σ = 27839306880. Its totient is φ = 3944201920.

The previous prime is 11881812133. The next prime is 11881812191. The reversal of 11881812156 is 65121818811.

It is a happy number.

It is a super-2 number, since 2×11881812156² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3245455 + ... + 3249113.

It is an arithmetic number, because the mean of its divisors is an integer number (579985560).

Almost surely, 2^11881812156 is an apocalyptic number.

It is an amenable number.

11881812156 is an abundant number, since it is smaller than the sum of its proper divisors (15957494724).

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

11881812156 is a wasteful number, since it uses less digits than its factorization.

11881812156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4714 (or 4712 counting only the distinct ones).

The product of its digits is 30720, while the sum is 42.

The spelling of 11881812156 in words is "eleven billion, eight hundred eighty-one million, eight hundred twelve thousand, one hundred fifty-six".