16646725 has 12 divisors (see below), whose sum is σ = 21354660. Its totient is φ = 12857600.

The previous prime is 16646711. The next prime is 16646741. The reversal of 16646725 is 52764661.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 16641 + 16630084 = 129^2 + 4078^2 .

It is not a de Polignac number, because 16646725 - 2¹⁹ = 16122437 is a prime.

It is a super-2 number, since 2×16646725² = 554226906451250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10756 + ... + 12205.

It is an arithmetic number, because the mean of its divisors is an integer number (1779555).

Almost surely, 2^16646725 is an apocalyptic number.

It is an amenable number.

16646725 is a deficient number, since it is larger than the sum of its proper divisors (4707935).

16646725 is a wasteful number, since it uses less digits than its factorization.

16646725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23000 (or 22995 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 16646725 is about 4080.0398282370. The cubic root of 16646725 is about 255.3345602239.

It can be divided in two parts, 16646 and 725, that added together give a palindrome (17371).

The spelling of 16646725 in words is "sixteen million, six hundred forty-six thousand, seven hundred twenty-five".