6664664220 has 48 divisors (see below), whose sum is σ = 19165419168. Its totient is φ = 1729209600.

The previous prime is 6664664189. The next prime is 6664664221. The reversal of 6664664220 is 224664666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664664221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1498831 + ... + 1503270.

It is an arithmetic number, because the mean of its divisors is an integer number (399279566).

Almost surely, 2^6664664220 is an apocalyptic number.

6664664220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6664664220 is an abundant number, since it is smaller than the sum of its proper divisors (12500754948).

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

6664664220 is a wasteful number, since it uses less digits than its factorization.

6664664220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002150 (or 3002148 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 42.

The square root of 6664664220 is about 81637.3947404007. The cubic root of 6664664220 is about 1881.8836014462.

The spelling of 6664664220 in words is "six billion, six hundred sixty-four million, six hundred sixty-four thousand, two hundred twenty".