16564037666406 has 16 divisors (see below), whose sum is σ = 33160585723200. Its totient is φ = 5515927490408.

The previous prime is 16564037666389. The next prime is 16564037666471. The reversal of 16564037666406 is 60466673046561.

It is a super-2 number, since 2×16564037666406² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16564037666406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1354592976 + ... + 1354605203.

It is an arithmetic number, because the mean of its divisors is an integer number (2072536607700).

Almost surely, 2^{16564037666406} is an apocalyptic number.

16564037666406 is an abundant number, since it is smaller than the sum of its proper divisors (16596548056794).

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

16564037666406 is a wasteful number, since it uses less digits than its factorization.

16564037666406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709199203.

The product of its (nonzero) digits is 78382080, while the sum is 60.

The spelling of 16564037666406 in words is "sixteen trillion, five hundred sixty-four billion, thirty-seven million, six hundred sixty-six thousand, four hundred six".