11988565541 has 2 divisors, whose sum is σ = 11988565542. Its totient is φ = 11988565540.

The previous prime is 11988565531. The next prime is 11988565553. The reversal of 11988565541 is 14556588911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6549503041 + 5439062500 = 80929^2 + 73750^2 .

It is an emirp because it is prime and its reverse (14556588911) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11988565541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11988565531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5994282770 + 5994282771.

It is an arithmetic number, because the mean of its divisors is an integer number (5994282771).

Almost surely, 2^11988565541 is an apocalyptic number.

It is an amenable number.

11988565541 is a deficient number, since it is larger than the sum of its proper divisors (1).

11988565541 is an equidigital number, since it uses as much as digits as its factorization.

11988565541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728000, while the sum is 53.

The spelling of 11988565541 in words is "eleven billion, nine hundred eighty-eight million, five hundred sixty-five thousand, five hundred forty-one".