668215699200 has 864 divisors, whose sum is σ = 2822364357120. Its totient is φ = 151533158400.

The previous prime is 668215699199. The next prime is 668215699211. The reversal of 668215699200 is 2996512866.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 158455492 + ... + 158459708.

Almost surely, 2^668215699200 is an apocalyptic number.

668215699200 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668215699200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1411182178560).

668215699200 is an abundant number, since it is smaller than the sum of its proper divisors (2154148657920).

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

668215699200 is a wasteful number, since it uses less digits than its factorization.

668215699200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4390 (or 4365 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 668215699200 in words is "six hundred sixty-eight billion, two hundred fifteen million, six hundred ninety-nine thousand, two hundred".