16643525 has 24 divisors (see below), whose sum is σ = 22334880. Its totient is φ = 12260160.

The previous prime is 16643521. The next prime is 16643531. The reversal of 16643525 is 52534661.

It is not a de Polignac number, because 16643525 - 2² = 16643521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16643491 and 16643500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16643521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17102 + ... + 18048.

It is an arithmetic number, because the mean of its divisors is an integer number (930620).

Almost surely, 2^16643525 is an apocalyptic number.

It is an amenable number.

16643525 is a deficient number, since it is larger than the sum of its proper divisors (5691355).

16643525 is a wasteful number, since it uses less digits than its factorization.

16643525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013 (or 1008 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 16643525 is about 4079.6476563547. The cubic root of 16643525 is about 255.3181981877.

The spelling of 16643525 in words is "sixteen million, six hundred forty-three thousand, five hundred twenty-five".