11981445572 has 24 divisors (see below), whose sum is σ = 22481948160. Its totient is φ = 5566953600.

The previous prime is 11981445547. The next prime is 11981445607. The reversal of 11981445572 is 27554418911.

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, 1109804 + ... + 1120547.

It is an arithmetic number, because the mean of its divisors is an integer number (936747840).

Almost surely, 2^11981445572 is an apocalyptic number.

It is an amenable number.

11981445572 is a deficient number, since it is larger than the sum of its proper divisors (10500502588).

11981445572 is a wasteful number, since it uses less digits than its factorization.

11981445572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230451 (or 2230449 counting only the distinct ones).

The product of its digits is 403200, while the sum is 47.

The spelling of 11981445572 in words is "eleven billion, nine hundred eighty-one million, four hundred forty-five thousand, five hundred seventy-two".