1666101 has 8 divisors (see below), whose sum is σ = 2259360. Its totient is φ = 1091792.

The previous prime is 1666081. The next prime is 1666111. The reversal of 1666101 is 1016661.

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

It is a cyclic number.

It is not a de Polignac number, because 1666101 - 2⁶ = 1666037 is a prime.

1666101 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666111) 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 7 ways as a sum of consecutive naturals, for example, 4530 + ... + 4883.

It is an arithmetic number, because the mean of its divisors is an integer number (282420).

2^1666101 is an apocalyptic number.

It is an amenable number.

1666101 is a deficient number, since it is larger than the sum of its proper divisors (593259).

1666101 is an equidigital number, since it uses as much as digits as its factorization.

1666101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9475.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1666101 is about 1290.7753483856. The cubic root of 1666101 is about 118.5496951920.

The spelling of 1666101 in words is "one million, six hundred sixty-six thousand, one hundred one".