11719721544 has 64 divisors (see below), whose sum is σ = 29671587840. Its totient is φ = 3857232960.

The previous prime is 11719721543. The next prime is 11719721557. The reversal of 11719721544 is 44512791711.

It is a junction number, because it is equal to n+sod(n) for n = 11719721496 and 11719721505.

It is not an unprimeable number, because it can be changed into a prime (11719721543) 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, 634017 + ... + 652239.

It is an arithmetic number, because the mean of its divisors is an integer number (463618560).

Almost surely, 2^11719721544 is an apocalyptic number.

It is an amenable number.

11719721544 is an abundant number, since it is smaller than the sum of its proper divisors (17951866296).

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

11719721544 is a wasteful number, since it uses less digits than its factorization.

11719721544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18570 (or 18566 counting only the distinct ones).

The product of its digits is 70560, while the sum is 42.

The spelling of 11719721544 in words is "eleven billion, seven hundred nineteen million, seven hundred twenty-one thousand, five hundred forty-four".