2166654666 has 64 divisors (see below), whose sum is σ = 4898635776. Its totient is φ = 632923200.

The previous prime is 2166654661. The next prime is 2166654689. The reversal of 2166654666 is 6664566612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2166654661) 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 31 ways as a sum of consecutive naturals, for example, 564831 + ... + 568653.

It is an arithmetic number, because the mean of its divisors is an integer number (76541184).

Almost surely, 2^2166654666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166654666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2449317888).

2166654666 is an abundant number, since it is smaller than the sum of its proper divisors (2731981110).

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

2166654666 is a wasteful number, since it uses less digits than its factorization.

2166654666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4147.

The product of its digits is 1866240, while the sum is 48.

The square root of 2166654666 is about 46547.3379045462. The cubic root of 2166654666 is about 1293.9869570688.

It can be divided in two parts, 21666546 and 66, that added together give a palindrome (21666612).

The spelling of 2166654666 in words is "two billion, one hundred sixty-six million, six hundred fifty-four thousand, six hundred sixty-six".