16659625 has 8 divisors (see below), whose sum is σ = 20791368. Its totient is φ = 13327600.

The previous prime is 16659581. The next prime is 16659641. The reversal of 16659625 is 52695661.

It can be written as a sum of positive squares in 4 ways, for example, as 1065024 + 15594601 = 1032^2 + 3949^2 .

It is not a de Polignac number, because 16659625 - 2⁷ = 16659497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66514 + ... + 66763.

It is an arithmetic number, because the mean of its divisors is an integer number (2598921).

Almost surely, 2^16659625 is an apocalyptic number.

It is an amenable number.

16659625 is a deficient number, since it is larger than the sum of its proper divisors (4131743).

16659625 is an equidigital number, since it uses as much as digits as its factorization.

16659625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133292 (or 133282 counting only the distinct ones).

The product of its digits is 97200, while the sum is 40.

The square root of 16659625 is about 4081.6203890122. The cubic root of 16659625 is about 255.4004984264.

The spelling of 16659625 in words is "sixteen million, six hundred fifty-nine thousand, six hundred twenty-five".