16421760541664 has 96 divisors (see below), whose sum is σ = 34072073570304. Its totient is φ = 7775801313280.

The previous prime is 16421760541661. The next prime is 16421760541763. The reversal of 16421760541664 is 46614506712461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16421760541661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75657677 + ... + 75874419.

It is an arithmetic number, because the mean of its divisors is an integer number (354917433024).

Almost surely, 2^{16421760541664} 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 16421760541664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17036036785152).

16421760541664 is an abundant number, since it is smaller than the sum of its proper divisors (17650313028640).

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

16421760541664 is a wasteful number, since it uses less digits than its factorization.

16421760541664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217800 (or 217792 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 53.

The spelling of 16421760541664 in words is "sixteen trillion, four hundred twenty-one billion, seven hundred sixty million, five hundred forty-one thousand, six hundred sixty-four".