66206220 has 24 divisors (see below), whose sum is σ = 185377584. Its totient is φ = 17654976.

The previous prime is 66206219. The next prime is 66206227. The reversal of 66206220 is 2260266.

66206220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66206227) 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 7 ways as a sum of consecutive naturals, for example, 551659 + ... + 551778.

It is an arithmetic number, because the mean of its divisors is an integer number (7724066).

Almost surely, 2^66206220 is an apocalyptic number.

66206220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66206220 is an abundant number, since it is smaller than the sum of its proper divisors (119171364).

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

66206220 is a wasteful number, since it uses less digits than its factorization.

66206220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103449 (or 1103447 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 66206220 is about 8136.7204695750. The cubic root of 66206220 is about 404.5444657178.

Adding to 66206220 its reverse (2260266), we get a palindrome (68466486).

The spelling of 66206220 in words is "sixty-six million, two hundred six thousand, two hundred twenty".