16661625 has 32 divisors (see below), whose sum is σ = 28000128. Its totient is φ = 8798400.

The previous prime is 16661599. The next prime is 16661629. The reversal of 16661625 is 52616661.

It is not a de Polignac number, because 16661625 - 2⁸ = 16661369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16661629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58734 + ... + 59016.

It is an arithmetic number, because the mean of its divisors is an integer number (875004).

Almost surely, 2^16661625 is an apocalyptic number.

16661625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16661625 is a deficient number, since it is larger than the sum of its proper divisors (11338503).

16661625 is a wasteful number, since it uses less digits than its factorization.

16661625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458 (or 448 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 16661625 is about 4081.8653823957. The cubic root of 16661625 is about 255.4107183555.

The spelling of 16661625 in words is "sixteen million, six hundred sixty-one thousand, six hundred twenty-five".