16691554323808 has 216 divisors, whose sum is σ = 42820720346880. Its totient is φ = 6375550970880.

The previous prime is 16691554323737. The next prime is 16691554323811. The reversal of 16691554323808 is 80832345519661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6598753 + ... + 8770783.

It is an arithmetic number, because the mean of its divisors is an integer number (198244075680).

Almost surely, 2^{16691554323808} 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 16691554323808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21410360173440).

16691554323808 is an abundant number, since it is smaller than the sum of its proper divisors (26129166023072).

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

16691554323808 is a wasteful number, since it uses less digits than its factorization.

16691554323808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172110 (or 2172082 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 61.

The spelling of 16691554323808 in words is "sixteen trillion, six hundred ninety-one billion, five hundred fifty-four million, three hundred twenty-three thousand, eight hundred eight".