1666020116 has 12 divisors (see below), whose sum is σ = 2921266740. Its totient is φ = 831372480.

The previous prime is 1666020091. The next prime is 1666020119. The reversal of 1666020116 is 6110206661.

It can be written as a sum of positive squares in 2 ways, for example, as 1496916100 + 169104016 = 38690^2 + 13004^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666020119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407105 + ... + 411176.

It is an arithmetic number, because the mean of its divisors is an integer number (243438895).

Almost surely, 2^1666020116 is an apocalyptic number.

It is an amenable number.

1666020116 is a deficient number, since it is larger than the sum of its proper divisors (1255246624).

1666020116 is a wasteful number, since it uses less digits than its factorization.

1666020116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818794 (or 818792 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1666020116 is about 40816.9096821403. The cubic root of 1666020116 is about 1185.4777675515.

Adding to 1666020116 its reverse (6110206661), we get a palindrome (7776226777).

The spelling of 1666020116 in words is "one billion, six hundred sixty-six million, twenty thousand, one hundred sixteen".