16678538565 has 32 divisors (see below), whose sum is σ = 29209547136. Its totient is φ = 8076360960.

The previous prime is 16678538557. The next prime is 16678538567. The reversal of 16678538565 is 56583587661.

16678538565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16678538565 - 2³ = 16678538557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16678538499 and 16678538508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16678538567) 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 31 ways as a sum of consecutive naturals, for example, 689179 + ... + 712968.

It is an arithmetic number, because the mean of its divisors is an integer number (912798348).

Almost surely, 2^16678538565 is an apocalyptic number.

16678538565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16678538565 is a deficient number, since it is larger than the sum of its proper divisors (12531008571).

16678538565 is a wasteful number, since it uses less digits than its factorization.

16678538565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402229.

The product of its digits is 36288000, while the sum is 60.

The spelling of 16678538565 in words is "sixteen billion, six hundred seventy-eight million, five hundred thirty-eight thousand, five hundred sixty-five".