6661250 has 30 divisors (see below), whose sum is σ = 12659229. Its totient is φ = 2628000.

The previous prime is 6661243. The next prime is 6661273. The reversal of 6661250 is 521666.

It can be written as a sum of positive squares in 8 ways, for example, as 305809 + 6355441 = 553^2 + 2521^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=1825.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 91214 + ... + 91286.

Almost surely, 2^6661250 is an apocalyptic number.

6661250 is a deficient number, since it is larger than the sum of its proper divisors (5997979).

6661250 is an frugal number, since it uses more digits than its factorization.

6661250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 6661250 is about 2580.9397513309. The cubic root of 6661250 is about 188.1562191799.

It can be divided in two parts, 66 and 61250, that added together give a palindrome (61316).

The spelling of 6661250 in words is "six million, six hundred sixty-one thousand, two hundred fifty".