16643625 has 16 divisors (see below), whose sum is σ = 27695616. Its totient is φ = 8876400.

The previous prime is 16643617. The next prime is 16643647. The reversal of 16643625 is 52634661.

It is not a de Polignac number, because 16643625 - 2³ = 16643617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21817 + ... + 22566.

It is an arithmetic number, because the mean of its divisors is an integer number (1730976).

Almost surely, 2^16643625 is an apocalyptic number.

16643625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16643625 is a deficient number, since it is larger than the sum of its proper divisors (11051991).

16643625 is an equidigital number, since it uses as much as digits as its factorization.

16643625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44401 (or 44391 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 16643625 is about 4079.6599122966. The cubic root of 16643625 is about 255.3187095331.

The spelling of 16643625 in words is "sixteen million, six hundred forty-three thousand, six hundred twenty-five".