1666061 has 2 divisors, whose sum is σ = 1666062. Its totient is φ = 1666060.

The previous prime is 1666043. The next prime is 1666081. The reversal of 1666061 is 1606661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1196836 + 469225 = 1094^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666061 - 2⁶ = 1665997 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1666061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833030 + 833031.

It is an arithmetic number, because the mean of its divisors is an integer number (833031).

2^1666061 is an apocalyptic number.

It is an amenable number.

1666061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666061 is an equidigital number, since it uses as much as digits as its factorization.

1666061 is an evil number, because the sum of its binary digits is even.

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

The square root of 1666061 is about 1290.7598537296. The cubic root of 1666061 is about 118.5487464649.

The spelling of 1666061 in words is "one million, six hundred sixty-six thousand, sixty-one".