16660625 has 40 divisors (see below), whose sum is σ = 23242560. Its totient is φ = 11880000.

The previous prime is 16660621. The next prime is 16660639. The reversal of 16660625 is 52606661.

It is not a de Polignac number, because 16660625 - 2² = 16660621 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16660591 and 16660600.

It is not an unprimeable number, because it can be changed into a prime (16660621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 273095 + ... + 273155.

It is an arithmetic number, because the mean of its divisors is an integer number (581064).

Almost surely, 2^16660625 is an apocalyptic number.

It is an amenable number.

16660625 is a deficient number, since it is larger than the sum of its proper divisors (6581935).

16660625 is an equidigital number, since it uses as much as digits as its factorization.

16660625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 16660625 is about 4081.7428875420. The cubic root of 16660625 is about 255.4056084932.

The spelling of 16660625 in words is "sixteen million, six hundred sixty thousand, six hundred twenty-five".