66205722 has 32 divisors (see below), whose sum is σ = 145866240. Its totient is φ = 19865520.

The previous prime is 66205721. The next prime is 66205723. The reversal of 66205722 is 22750266.

66205722 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66205721) and next prime (66205723).

It is a self number, because there is not a number n which added to its sum of digits gives 66205722.

It is not an unprimeable number, because it can be changed into a prime (66205721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1929 + ... + 11667.

It is an arithmetic number, because the mean of its divisors is an integer number (4558320).

Almost surely, 2^66205722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66205722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72933120).

66205722 is an abundant number, since it is smaller than the sum of its proper divisors (79660518).

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

66205722 is a wasteful number, since it uses less digits than its factorization.

66205722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9858.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 66205722 is about 8136.6898675075. The cubic root of 66205722 is about 404.5434513939.

Adding to 66205722 its reverse (22750266), we get a palindrome (88955988).

The spelling of 66205722 in words is "sixty-six million, two hundred five thousand, seven hundred twenty-two".