1666066 has 4 divisors (see below), whose sum is σ = 2499102. Its totient is φ = 833032.

The previous prime is 1666061. The next prime is 1666081. The reversal of 1666066 is 6606661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1615441 + 50625 = 1271^2 + 225^2 .

It is not an unprimeable number, because it can be changed into a prime (1666061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416515 + ... + 416518.

2^1666066 is an apocalyptic number.

1666066 is a deficient number, since it is larger than the sum of its proper divisors (833036).

1666066 is an equidigital number, since it uses as much as digits as its factorization.

1666066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833035.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 1666066 is about 1290.7617905718. The cubic root of 1666066 is about 118.5488650566.

The spelling of 1666066 in words is "one million, six hundred sixty-six thousand, sixty-six".