665716352000 has 704 divisors, whose sum is σ = 1977303744000. Its totient is φ = 223503974400.

The previous prime is 665716351981. The next prime is 665716352009. The reversal of 665716352000 is 253617566.

It is a super-2 number, since 2×665716352000² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665716352009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2590335872 + ... + 2590336128.

Almost surely, 2^665716352000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665716352000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (988651872000).

665716352000 is an abundant number, since it is smaller than the sum of its proper divisors (1311587392000).

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

665716352000 is an equidigital number, since it uses as much as digits as its factorization.

665716352000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 41.

Adding to 665716352000 its reverse (253617566), we get a palindrome (665969969566).

The spelling of 665716352000 in words is "six hundred sixty-five billion, seven hundred sixteen million, three hundred fifty-two thousand".