2528717085509 has 2 divisors, whose sum is σ = 2528717085510. Its totient is φ = 2528717085508.

The previous prime is 2528717085421. The next prime is 2528717085533. The reversal of 2528717085509 is 9055807178252.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2008186581025 + 520530504484 = 1417105^2 + 721478^2 .

It is a cyclic number.

It is not a de Polignac number, because 2528717085509 - 2²⁰ = 2528716036933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2528717085539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1264358542754 + 1264358542755.

It is an arithmetic number, because the mean of its divisors is an integer number (1264358542755).

Almost surely, 2^{2528717085509} is an apocalyptic number.

It is an amenable number.

2528717085509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2528717085509 is an equidigital number, since it uses as much as digits as its factorization.

2528717085509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112000, while the sum is 59.

The spelling of 2528717085509 in words is "two trillion, five hundred twenty-eight billion, seven hundred seventeen million, eighty-five thousand, five hundred nine".