16643705388840 has 128 divisors (see below), whose sum is σ = 55811228256000. Its totient is φ = 4411744614144.

The previous prime is 16643705388823. The next prime is 16643705388847. The reversal of 16643705388840 is 4888350734661.

16643705388840 is a `hidden beast` number, since 1 + 6 + 64 + 37 + 0 + 538 + 8 + 8 + 4 + 0 = 666.

16643705388840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (16643705388847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45959875 + ... + 46320594.

It is an arithmetic number, because the mean of its divisors is an integer number (436025220750).

Almost surely, 2^{16643705388840} is an apocalyptic number.

16643705388840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16643705388840 is an abundant number, since it is smaller than the sum of its proper divisors (39167522867160).

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

16643705388840 is a wasteful number, since it uses less digits than its factorization.

16643705388840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92280656 (or 92280646 counting only the distinct ones).

The product of its (nonzero) digits is 92897280, while the sum is 63.

The spelling of 16643705388840 in words is "sixteen trillion, six hundred forty-three billion, seven hundred five million, three hundred eighty-eight thousand, eight hundred forty".