11722216525 has 6 divisors (see below), whose sum is σ = 14535548522. Its totient is φ = 9377773200.

The previous prime is 11722216507. The next prime is 11722216529. The reversal of 11722216525 is 52561222711.

It can be written as a sum of positive squares in 3 ways, for example, as 868952484 + 10853264041 = 29478^2 + 104179^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11722216525 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11722216529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 234444306 + ... + 234444355.

Almost surely, 2^11722216525 is an apocalyptic number.

It is an amenable number.

11722216525 is a deficient number, since it is larger than the sum of its proper divisors (2813331997).

11722216525 is an equidigital number, since it uses as much as digits as its factorization.

11722216525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468888671 (or 468888666 counting only the distinct ones).

The product of its digits is 16800, while the sum is 34.

The spelling of 11722216525 in words is "eleven billion, seven hundred twenty-two million, two hundred sixteen thousand, five hundred twenty-five".