1666325 has 6 divisors (see below), whose sum is σ = 2066274. Its totient is φ = 1333040.

The previous prime is 1666321. The next prime is 1666339. The reversal of 1666325 is 5236661.

It can be written as a sum of positive squares in 3 ways, for example, as 22801 + 1643524 = 151^2 + 1282^2 .

It is not a de Polignac number, because 1666325 - 2² = 1666321 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33302 + ... + 33351.

It is an arithmetic number, because the mean of its divisors is an integer number (344379).

2^1666325 is an apocalyptic number.

It is an amenable number.

1666325 is a deficient number, since it is larger than the sum of its proper divisors (399949).

1666325 is an equidigital number, since it uses as much as digits as its factorization.

1666325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66663 (or 66658 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 1666325 is about 1290.8621150224. The cubic root of 1666325 is about 118.5550077835. Note that the first 3 decimals are identical.

It can be divided in two parts, 1666 and 325, that added together give a palindrome (1991).

The spelling of 1666325 in words is "one million, six hundred sixty-six thousand, three hundred twenty-five".