16561625 has 16 divisors (see below), whose sum is σ = 21116160. Its totient is φ = 12962800.

The previous prime is 16561613. The next prime is 16561627. The reversal of 16561625 is 52616561.

It is not a de Polignac number, because 16561625 - 2¹⁴ = 16545241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16561591 and 16561600.

It is not an unprimeable number, because it can be changed into a prime (16561627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4466 + ... + 7284.

It is an arithmetic number, because the mean of its divisors is an integer number (1319760).

Almost surely, 2^16561625 is an apocalyptic number.

It is an amenable number.

16561625 is a deficient number, since it is larger than the sum of its proper divisors (4554535).

16561625 is an equidigital number, since it uses as much as digits as its factorization.

16561625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881 (or 2871 counting only the distinct ones).

The product of its digits is 10800, while the sum is 32.

The square root of 16561625 is about 4069.5976459596. The cubic root of 16561625 is about 254.8987166650.

The spelling of 16561625 in words is "sixteen million, five hundred sixty-one thousand, six hundred twenty-five".