665814130000 has 50 divisors (see below), whose sum is σ = 1612002614354. Its totient is φ = 266325648000.

The previous prime is 665814129989. The next prime is 665814130021. The reversal of 665814130000 is 31418566.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 219087652624 + 446726477376 = 468068^2 + 668376^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 33280707 + ... + 33300706.

Almost surely, 2^665814130000 is an apocalyptic number.

It is an amenable number.

665814130000 is an abundant number, since it is smaller than the sum of its proper divisors (946188484354).

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

665814130000 is an equidigital number, since it uses as much as digits as its factorization.

665814130000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66581441 (or 66581420 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

Adding to 665814130000 its reverse (31418566), we get a palindrome (665845548566).

The spelling of 665814130000 in words is "six hundred sixty-five billion, eight hundred fourteen million, one hundred thirty thousand".