16580055985 has 16 divisors (see below), whose sum is σ = 20282282064. Its totient is φ = 13006835712.

The previous prime is 16580055959. The next prime is 16580055997. The reversal of 16580055985 is 58955008561.

It can be written as a sum of positive squares in 8 ways, for example, as 3973033024 + 12607022961 = 63032^2 + 112281^2 .

It is a cyclic number.

It is not a de Polignac number, because 16580055985 - 2⁹ = 16580055473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 512449 + ... + 543841.

It is an arithmetic number, because the mean of its divisors is an integer number (1267642629).

Almost surely, 2^16580055985 is an apocalyptic number.

It is an amenable number.

16580055985 is a deficient number, since it is larger than the sum of its proper divisors (3702226079).

16580055985 is a wasteful number, since it uses less digits than its factorization.

16580055985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33444.

The product of its (nonzero) digits is 2160000, while the sum is 52.

The spelling of 16580055985 in words is "sixteen billion, five hundred eighty million, fifty-five thousand, nine hundred eighty-five".