11997911443 has 8 divisors (see below), whose sum is σ = 13726666080. Its totient is φ = 10272848640.

The previous prime is 11997911413. The next prime is 11997911509. The reversal of 11997911443 is 34411979911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11997911443 - 2¹⁷ = 11997780371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11997911413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 915988 + ... + 928993.

It is an arithmetic number, because the mean of its divisors is an integer number (1715833260).

Almost surely, 2^11997911443 is an apocalyptic number.

11997911443 is a deficient number, since it is larger than the sum of its proper divisors (1728754637).

11997911443 is an equidigital number, since it uses as much as digits as its factorization.

11997911443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845917.

The product of its digits is 244944, while the sum is 49.

The spelling of 11997911443 in words is "eleven billion, nine hundred ninety-seven million, nine hundred eleven thousand, four hundred forty-three".