11756873521 has 2 divisors, whose sum is σ = 11756873522. Its totient is φ = 11756873520.

The previous prime is 11756873519. The next prime is 11756873563. The reversal of 11756873521 is 12537865711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8048063521 + 3708810000 = 89711^2 + 60900^2 .

It is a cyclic number.

It is not a de Polignac number, because 11756873521 - 2¹ = 11756873519 is a prime.

Together with 11756873519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11756873021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5878436760 + 5878436761.

It is an arithmetic number, because the mean of its divisors is an integer number (5878436761).

Almost surely, 2^11756873521 is an apocalyptic number.

It is an amenable number.

11756873521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11756873521 is an equidigital number, since it uses as much as digits as its factorization.

11756873521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 46.

The spelling of 11756873521 in words is "eleven billion, seven hundred fifty-six million, eight hundred seventy-three thousand, five hundred twenty-one".