665380757812 has 12 divisors (see below), whose sum is σ = 1167068758240. Its totient is φ = 331932541176.

The previous prime is 665380757801. The next prime is 665380757849. The reversal of 665380757812 is 218757083566.

It is a happy number.

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 3 ways as a sum of consecutive naturals, for example, 189457458 + ... + 189460969.

Almost surely, 2^665380757812 is an apocalyptic number.

It is an amenable number.

665380757812 is a deficient number, since it is larger than the sum of its proper divisors (501688000428).

665380757812 is a wasteful number, since it uses less digits than its factorization.

665380757812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378918870 (or 378918868 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 58.

The spelling of 665380757812 in words is "six hundred sixty-five billion, three hundred eighty million, seven hundred fifty-seven thousand, eight hundred twelve".