1666552206 has 64 divisors (see below), whose sum is σ = 3834501120. Its totient is φ = 477560160.

The previous prime is 1666552201. The next prime is 1666552207. The reversal of 1666552206 is 6022556661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666552201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1036255 + ... + 1037861.

It is an arithmetic number, because the mean of its divisors is an integer number (59914080).

Almost surely, 2^1666552206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666552206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1917250560).

1666552206 is an abundant number, since it is smaller than the sum of its proper divisors (2167948914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666552206 is a wasteful number, since it uses less digits than its factorization.

1666552206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 1666552206 is about 40823.4271711722. The cubic root of 1666552206 is about 1185.6039592501.

It can be divided in two parts, 166655 and 2206, that added together give a palindrome (168861).

The spelling of 1666552206 in words is "one billion, six hundred sixty-six million, five hundred fifty-two thousand, two hundred six".