666800599320 has 192 divisors, whose sum is σ = 2186429656320. Its totient is φ = 176233865472.

The previous prime is 666800599301. The next prime is 666800599321. The reversal of 666800599320 is 23995008666.

It is a super-2 number, since 2×666800599320² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666800599321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20845659 + ... + 20877621.

It is an arithmetic number, because the mean of its divisors is an integer number (11387654460).

Almost surely, 2^666800599320 is an apocalyptic number.

666800599320 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 666800599320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1093214828160).

666800599320 is an abundant number, since it is smaller than the sum of its proper divisors (1519629057000).

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

666800599320 is a wasteful number, since it uses less digits than its factorization.

666800599320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32494 (or 32487 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 666800599320 in words is "six hundred sixty-six billion, eight hundred million, five hundred ninety-nine thousand, three hundred twenty".