6625 has 8 divisors (see below), whose sum is σ = 8424. Its totient is φ = 5200.

The previous prime is 6619. The next prime is 6637. The reversal of 6625 is 5266.

6625 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in 4 ways, for example, as 64 + 6561 = 8^2 + 81^2 .

It is not a de Polignac number, because 6625 - 2⁹ = 6113 is a prime.

It is a Duffinian number.

6625 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99 + ... + 151.

It is an arithmetic number, because the mean of its divisors is an integer number (1053).

2⁶⁶²⁵ is an apocalyptic number.

It is an amenable number.

6625 is a deficient number, since it is larger than the sum of its proper divisors (1799).

6625 is an equidigital number, since it uses as much as digits as its factorization.

6625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68 (or 58 counting only the distinct ones).

The product of its digits is 360, while the sum is 19.

The square root of 6625 is about 81.3941029805. The cubic root of 6625 is about 18.7814287711.

It can be divided in two parts, 66 and 25, that added together give a triangular number (91 = T₁₃).

The spelling of 6625 in words is "six thousand, six hundred twenty-five".