66654220 has 24 divisors (see below), whose sum is σ = 140339808. Its totient is φ = 26592000.

The previous prime is 66654197. The next prime is 66654221. The reversal of 66654220 is 2245666.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66654221) 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 7 ways as a sum of consecutive naturals, for example, 3865 + ... + 12175.

It is an arithmetic number, because the mean of its divisors is an integer number (5847492).

Almost surely, 2^66654220 is an apocalyptic number.

It is an amenable number.

66654220 is an abundant number, since it is smaller than the sum of its proper divisors (73685588).

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

66654220 is a wasteful number, since it uses less digits than its factorization.

66654220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8721 (or 8719 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 66654220 is about 8164.2035741400. The cubic root of 66654220 is about 405.4548970874.

Adding to 66654220 its reverse (2245666), we get a palindrome (68899886).

The spelling of 66654220 in words is "sixty-six million, six hundred fifty-four thousand, two hundred twenty".