11115516000521 has 2 divisors, whose sum is σ = 11115516000522. Its totient is φ = 11115516000520.

The previous prime is 11115516000509. The next prime is 11115516000607. The reversal of 11115516000521 is 12500061551111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5982622483600 + 5132893516921 = 2445940^2 + 2265589^2 .

It is an emirp because it is prime and its reverse (12500061551111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11115516000521 - 2¹⁸ = 11115515738377 is a prime.

It is not a weakly prime, because it can be changed into another prime (11115516003521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5557758000260 + 5557758000261.

It is an arithmetic number, because the mean of its divisors is an integer number (5557758000261).

Almost surely, 2^{11115516000521} is an apocalyptic number.

It is an amenable number.

11115516000521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11115516000521 is an equidigital number, since it uses as much as digits as its factorization.

11115516000521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500, while the sum is 29.

Adding to 11115516000521 its reverse (12500061551111), we get a palindrome (23615577551632).

The spelling of 11115516000521 in words is "eleven trillion, one hundred fifteen billion, five hundred sixteen million, five hundred twenty-one", and thus it is an aban number.