1666106 has 8 divisors (see below), whose sum is σ = 2691444. Its totient is φ = 768960.

The previous prime is 1666081. The next prime is 1666111. The reversal of 1666106 is 6016661.

It can be written as a sum of positive squares in 2 ways, for example, as 1540081 + 126025 = 1241^2 + 355^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 64081 = 1666106 / (1 + 6 + 6 + 6 + 1 + 0 + 6).

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 32015 + ... + 32066.

2^1666106 is an apocalyptic number.

1666106 is a deficient number, since it is larger than the sum of its proper divisors (1025338).

1666106 is a wasteful number, since it uses less digits than its factorization.

1666106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64096.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1666106 is about 1290.7772852045. Note that the first 3 decimals coincide. The cubic root of 1666106 is about 118.5498137818.

The spelling of 1666106 in words is "one million, six hundred sixty-six thousand, one hundred six".