16645678313208 has 256 divisors, whose sum is σ = 50644185984000. Its totient is φ = 4458818617344.

The previous prime is 16645678313207. The next prime is 16645678313227. The reversal of 16645678313208 is 80231387654661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16645678313207) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24714663 + ... + 25379241.

It is an arithmetic number, because the mean of its divisors is an integer number (197828851500).

Almost surely, 2^{16645678313208} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16645678313208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25322092992000).

16645678313208 is an abundant number, since it is smaller than the sum of its proper divisors (33998507670792).

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

16645678313208 is a wasteful number, since it uses less digits than its factorization.

16645678313208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664774 (or 664770 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 60.

The spelling of 16645678313208 in words is "sixteen trillion, six hundred forty-five billion, six hundred seventy-eight million, three hundred thirteen thousand, two hundred eight".