6660625 has 10 divisors (see below), whose sum is σ = 8323898. Its totient is φ = 5328000.

The previous prime is 6660613. The next prime is 6660649. The reversal of 6660625 is 5260666.

It can be written as a sum of positive squares in 5 ways, for example, as 4422609 + 2238016 = 2103^2 + 1496^2 .

It is not a de Polignac number, because 6660625 - 2⁹ = 6660113 is a prime.

It is a Duffinian number.

6660625 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4704 + ... + 5953.

Almost surely, 2^6660625 is an apocalyptic number.

It is an amenable number.

6660625 is a deficient number, since it is larger than the sum of its proper divisors (1663273).

6660625 is an equidigital number, since it uses as much as digits as its factorization.

6660625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10677 (or 10662 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 6660625 is about 2580.8186685624. The cubic root of 6660625 is about 188.1503343328.

The spelling of 6660625 in words is "six million, six hundred sixty thousand, six hundred twenty-five".