16720408043406 has 64 divisors (see below), whose sum is σ = 39352158331200. Its totient is φ = 5244281975808.

The previous prime is 16720408043399. The next prime is 16720408043447. The reversal of 16720408043406 is 60434080402761.

16720408043406 is a `hidden beast` number, since 1 + 6 + 7 + 204 + 0 + 8 + 0 + 434 + 0 + 6 = 666.

It is a super-2 number, since 2×16720408043406² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1288936 + ... + 5924708.

It is an arithmetic number, because the mean of its divisors is an integer number (614877473925).

Almost surely, 2^{16720408043406} is an apocalyptic number.

16720408043406 is an abundant number, since it is smaller than the sum of its proper divisors (22631750287794).

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

16720408043406 is a wasteful number, since it uses less digits than its factorization.

16720408043406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4639730 (or 4639724 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The spelling of 16720408043406 in words is "sixteen trillion, seven hundred twenty billion, four hundred eight million, forty-three thousand, four hundred six".