16523509525 has 12 divisors (see below), whose sum is σ = 20562075684. Its totient is φ = 13171760000.

The previous prime is 16523509517. The next prime is 16523509529. The reversal of 16523509525 is 52590532561.

It can be written as a sum of positive squares in 6 ways, for example, as 1248774244 + 15274735281 = 35338^2 + 123591^2 .

It is not a de Polignac number, because 16523509525 - 2³ = 16523509517 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 (16523509529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1169026 + ... + 1183075.

It is an arithmetic number, because the mean of its divisors is an integer number (1713506307).

Almost surely, 2^16523509525 is an apocalyptic number.

It is an amenable number.

16523509525 is a deficient number, since it is larger than the sum of its proper divisors (4038566159).

16523509525 is a wasteful number, since it uses less digits than its factorization.

16523509525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2352392 (or 2352387 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 43.

The spelling of 16523509525 in words is "sixteen billion, five hundred twenty-three million, five hundred nine thousand, five hundred twenty-five".