16662725 has 12 divisors (see below), whose sum is σ = 20714820. Its totient is φ = 13296000.

The previous prime is 16662719. The next prime is 16662739. The reversal of 16662725 is 52726661.

16662725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 4082²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 1304164 + 15358561 = 1142^2 + 3919^2 .

It is not a de Polignac number, because 16662725 - 2⁶ = 16662661 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14471 + ... + 15579.

It is an arithmetic number, because the mean of its divisors is an integer number (1726235).

Almost surely, 2^16662725 is an apocalyptic number.

It is an amenable number.

16662725 is a deficient number, since it is larger than the sum of its proper divisors (4052095).

16662725 is a wasteful number, since it uses less digits than its factorization.

16662725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720 (or 1715 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 16662725 is about 4082.0001224890. Note that the first 3 decimals coincide. The cubic root of 16662725 is about 255.4163389679.

The spelling of 16662725 in words is "sixteen million, six hundred sixty-two thousand, seven hundred twenty-five".