11719721543 has 2 divisors, whose sum is σ = 11719721544. Its totient is φ = 11719721542.

The previous prime is 11719721479. The next prime is 11719721557. The reversal of 11719721543 is 34512791711.

It is a strong prime.

It is an emirp because it is prime and its reverse (34512791711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11719721543 - 2⁶ = 11719721479 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11719721543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11719721593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5859860771 + 5859860772.

It is an arithmetic number, because the mean of its divisors is an integer number (5859860772).

Almost surely, 2^11719721543 is an apocalyptic number.

11719721543 is a deficient number, since it is larger than the sum of its proper divisors (1).

11719721543 is an equidigital number, since it uses as much as digits as its factorization.

11719721543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 41.

The spelling of 11719721543 in words is "eleven billion, seven hundred nineteen million, seven hundred twenty-one thousand, five hundred forty-three".