665349996785040 has 480 divisors, whose sum is σ = 2722648031516160. Its totient is φ = 148844253487104.

The previous prime is 665349996784997. The next prime is 665349996785059. The reversal of 665349996785040 is 40587699943566.

665349996785040 is a `hidden beast` number, since 6 + 6 + 5 + 3 + 49 + 9 + 9 + 67 + 8 + 504 + 0 = 666.

665349996785040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 61901857 + ... + 71850816.

It is an arithmetic number, because the mean of its divisors is an integer number (5672183398992).

Almost surely, 2^{665349996785040} is an apocalyptic number.

665349996785040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665349996785040 is an abundant number, since it is smaller than the sum of its proper divisors (2057298034731120).

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

665349996785040 is a wasteful number, since it uses less digits than its factorization.

665349996785040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133752756 (or 133752737 counting only the distinct ones).

The product of its (nonzero) digits is 10581580800, while the sum is 81.

The spelling of 665349996785040 in words is "six hundred sixty-five trillion, three hundred forty-nine billion, nine hundred ninety-six million, seven hundred eighty-five thousand, forty".