16491553081344 has 864 divisors, whose sum is σ = 55058050101600. Its totient is φ = 4837161369600.

The previous prime is 16491553081243. The next prime is 16491553081351. The reversal of 16491553081344 is 44318035519461.

16491553081344 is a `hidden beast` number, since 1 + 6 + 4 + 9 + 1 + 553 + 0 + 81 + 3 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 129854748609 + ... + 129854748735.

It is an arithmetic number, because the mean of its divisors is an integer number (63724595025).

Almost surely, 2^{16491553081344} 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 16491553081344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27529025050800).

16491553081344 is an abundant number, since it is smaller than the sum of its proper divisors (38566497020256).

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

16491553081344 is an equidigital number, since it uses as much as digits as its factorization.

16491553081344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 16491553081344 in words is "sixteen trillion, four hundred ninety-one billion, five hundred fifty-three million, eighty-one thousand, three hundred forty-four".