16645678313212 has 144 divisors (see below), whose sum is σ = 33564102479712. Its totient is φ = 7194920878080.

The previous prime is 16645678313207. The next prime is 16645678313227. The reversal of 16645678313212 is 21231387654661.

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 (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3458480518 + ... + 3458485330.

It is an arithmetic number, because the mean of its divisors is an integer number (233084044998).

Almost surely, 2^{16645678313212} is an apocalyptic number.

It is an amenable number.

16645678313212 is an abundant number, since it is smaller than the sum of its proper divisors (16918424166500).

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

16645678313212 is a wasteful number, since it uses less digits than its factorization.

16645678313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6288 (or 6273 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 55.

The spelling of 16645678313212 in words is "sixteen trillion, six hundred forty-five billion, six hundred seventy-eight million, three hundred thirteen thousand, two hundred twelve".