16566525 has 54 divisors (see below), whose sum is σ = 31117242. Its totient is φ = 8748000.

The previous prime is 16566503. The next prime is 16566527. The reversal of 16566525 is 52566561.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4435236 + 12131289 = 2106^2 + 3483^2 .

It is not a de Polignac number, because 16566525 - 2¹⁸ = 16304381 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

Its product of digits (54000) is a multiple of the sum of its prime factors (135).

It is a self number, because there is not a number n which added to its sum of digits gives 16566525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16566527) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 163975 + ... + 164075.

Almost surely, 2^16566525 is an apocalyptic number.

16566525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16566525 is a deficient number, since it is larger than the sum of its proper divisors (14550717).

16566525 is an frugal number, since it uses more digits than its factorization.

16566525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 109 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 16566525 is about 4070.1996265540. The cubic root of 16566525 is about 254.9238526959.

Adding to 16566525 its sum of digits (36), we get a palindrome (16566561).

The spelling of 16566525 in words is "sixteen million, five hundred sixty-six thousand, five hundred twenty-five".