16572528509 has 2 divisors, whose sum is σ = 16572528510. Its totient is φ = 16572528508.

The previous prime is 16572528463. The next prime is 16572528527. The reversal of 16572528509 is 90582527561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13866240025 + 2706288484 = 117755^2 + 52022^2 .

It is a cyclic number.

It is not a de Polignac number, because 16572528509 - 2²⁰ = 16571479933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16572528559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8286264254 + 8286264255.

It is an arithmetic number, because the mean of its divisors is an integer number (8286264255).

Almost surely, 2^16572528509 is an apocalyptic number.

It is an amenable number.

16572528509 is a deficient number, since it is larger than the sum of its proper divisors (1).

16572528509 is an equidigital number, since it uses as much as digits as its factorization.

16572528509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512000, while the sum is 50.

The spelling of 16572528509 in words is "sixteen billion, five hundred seventy-two million, five hundred twenty-eight thousand, five hundred nine".