16665525 has 36 divisors (see below), whose sum is σ = 31612932. Its totient is φ = 8363520.

The previous prime is 16665511. The next prime is 16665529. The reversal of 16665525 is 52556661.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2331729 + 14333796 = 1527^2 + 3786^2 .

It is not a de Polignac number, because 16665525 - 2⁶ = 16665461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16665525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16665529) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1647 + ... + 6003.

It is an arithmetic number, because the mean of its divisors is an integer number (878137).

Almost surely, 2^16665525 is an apocalyptic number.

16665525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16665525 is a deficient number, since it is larger than the sum of its proper divisors (14947407).

16665525 is a wasteful number, since it uses less digits than its factorization.

16665525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4390 (or 4382 counting only the distinct ones).

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

The square root of 16665525 is about 4082.3430772046. The cubic root of 16665525 is about 255.4306448651.

The spelling of 16665525 in words is "sixteen million, six hundred sixty-five thousand, five hundred twenty-five".