668862216 has 48 divisors (see below), whose sum is σ = 1976186160. Its totient is φ = 202685280.

The previous prime is 668862211. The next prime is 668862251. The reversal of 668862216 is 612268866.

668862216 is a `hidden beast` number, since 6 + 6 + 8 + 8 + 622 + 16 = 666.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (668862211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 421470 + ... + 423053.

It is an arithmetic number, because the mean of its divisors is an integer number (41170545).

Almost surely, 2^668862216 is an apocalyptic number.

668862216 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

668862216 is an abundant number, since it is smaller than the sum of its proper divisors (1307323944).

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

668862216 is a wasteful number, since it uses less digits than its factorization.

668862216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844546 (or 844539 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 668862216 is about 25862.3706569989. The cubic root of 668862216 is about 874.5384084018.

The spelling of 668862216 in words is "six hundred sixty-eight million, eight hundred sixty-two thousand, two hundred sixteen".