668852217220 has 48 divisors (see below), whose sum is σ = 1553269794048. Its totient is φ = 239887215360.

The previous prime is 668852217217. The next prime is 668852217221. The reversal of 668852217220 is 22712258866.

It is a happy number.

It is a super-2 number, since 2×668852217220² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668852217221) 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, 20807484 + ... + 20839603.

It is an arithmetic number, because the mean of its divisors is an integer number (32359787376).

Almost surely, 2^668852217220 is an apocalyptic number.

It is an amenable number.

668852217220 is an abundant number, since it is smaller than the sum of its proper divisors (884417576828).

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

668852217220 is a wasteful number, since it uses less digits than its factorization.

668852217220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41647180 (or 41647178 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 668852217220 in words is "six hundred sixty-eight billion, eight hundred fifty-two million, two hundred seventeen thousand, two hundred twenty".