11997911444 has 12 divisors (see below), whose sum is σ = 21079997568. Its totient is φ = 5975055000.

The previous prime is 11997911413. The next prime is 11997911509. The reversal of 11997911444 is 44411979911.

It is a junction number, because it is equal to n+sod(n) for n = 11997911392 and 11997911401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5974052 + ... + 5976059.

It is an arithmetic number, because the mean of its divisors is an integer number (1756666464).

Almost surely, 2^11997911444 is an apocalyptic number.

It is an amenable number.

11997911444 is a deficient number, since it is larger than the sum of its proper divisors (9082086124).

11997911444 is a wasteful number, since it uses less digits than its factorization.

11997911444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11950366 (or 11950364 counting only the distinct ones).

The product of its digits is 326592, while the sum is 50.

The spelling of 11997911444 in words is "eleven billion, nine hundred ninety-seven million, nine hundred eleven thousand, four hundred forty-four".