11521658873 has 2 divisors, whose sum is σ = 11521658874. Its totient is φ = 11521658872.

The previous prime is 11521658867. The next prime is 11521658887. The reversal of 11521658873 is 37885612511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8395507129 + 3126151744 = 91627^2 + 55912^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11521658873 is a prime.

It is not a weakly prime, because it can be changed into another prime (11521678873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5760829436 + 5760829437.

It is an arithmetic number, because the mean of its divisors is an integer number (5760829437).

Almost surely, 2^11521658873 is an apocalyptic number.

It is an amenable number.

11521658873 is a deficient number, since it is larger than the sum of its proper divisors (1).

11521658873 is an equidigital number, since it uses as much as digits as its factorization.

11521658873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 47.

The spelling of 11521658873 in words is "eleven billion, five hundred twenty-one million, six hundred fifty-eight thousand, eight hundred seventy-three".