16581679685 has 16 divisors (see below), whose sum is σ = 21324318336. Its totient is φ = 12345651648.

The previous prime is 16581679661. The next prime is 16581679687. The reversal of 16581679685 is 58697618561.

16581679685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16581679685 - 2¹⁰ = 16581678661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16581679687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1944239 + ... + 1952748.

It is an arithmetic number, because the mean of its divisors is an integer number (1332769896).

Almost surely, 2^16581679685 is an apocalyptic number.

It is an amenable number.

16581679685 is a deficient number, since it is larger than the sum of its proper divisors (4742638651).

16581679685 is a wasteful number, since it uses less digits than its factorization.

16581679685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3897052.

The product of its digits is 21772800, while the sum is 62.

The spelling of 16581679685 in words is "sixteen billion, five hundred eighty-one million, six hundred seventy-nine thousand, six hundred eighty-five".