16663525 has 6 divisors (see below), whose sum is σ = 20662802. Its totient is φ = 13330800.

The previous prime is 16663511. The next prime is 16663529. The reversal of 16663525 is 52536661.

It can be written as a sum of positive squares in 3 ways, for example, as 66049 + 16597476 = 257^2 + 4074^2 .

It is not a de Polignac number, because 16663525 - 2⁷ = 16663397 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 (16663529) 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, 333246 + ... + 333295.

Almost surely, 2^16663525 is an apocalyptic number.

It is an amenable number.

16663525 is a deficient number, since it is larger than the sum of its proper divisors (3999277).

16663525 is an equidigital number, since it uses as much as digits as its factorization.

16663525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666551 (or 666546 counting only the distinct ones).

The product of its digits is 32400, while the sum is 34.

The square root of 16663525 is about 4082.0981124907. The cubic root of 16663525 is about 255.4204265306.

The spelling of 16663525 in words is "sixteen million, six hundred sixty-three thousand, five hundred twenty-five".