665630784000 has 3200 divisors, whose sum is σ = 3270057702912. Its totient is φ = 130587033600.

The previous prime is 665630783977. The next prime is 665630784023. The reversal of 665630784000 is 487036566.

665630784000 is a `hidden beast` number, since 6 + 6 + 5 + 630 + 7 + 8 + 4 + 0 + 0 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (665630783977) and next prime (665630784023).

It is a tau number, because it is divible by the number of its divisors (3200).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 8019647959 + ... + 8019648041.

Almost surely, 2^665630784000 is an apocalyptic number.

665630784000 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 665630784000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1635028851456).

665630784000 is an abundant number, since it is smaller than the sum of its proper divisors (2604426918912).

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

665630784000 is a wasteful number, since it uses less digits than its factorization.

665630784000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 665630784000 in words is "six hundred sixty-five billion, six hundred thirty million, seven hundred eighty-four thousand".