16666668518525 has 24 divisors (see below), whose sum is σ = 21565996455744. Its totient is φ = 12753165286400.

The previous prime is 16666668518503. The next prime is 16666668518531. The reversal of 16666668518525 is 52581586666661.

It is a de Polignac number, because none of the positive numbers 2^k-16666668518525 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15906845 + ... + 16922205.

It is an arithmetic number, because the mean of its divisors is an integer number (898583185656).

Almost surely, 2^{16666668518525} is an apocalyptic number.

It is an amenable number.

16666668518525 is a deficient number, since it is larger than the sum of its proper divisors (4899327937219).

16666668518525 is a wasteful number, since it uses less digits than its factorization.

16666668518525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043941 (or 1043936 counting only the distinct ones).

The product of its digits is 746496000, while the sum is 71.

The spelling of 16666668518525 in words is "sixteen trillion, six hundred sixty-six billion, six hundred sixty-eight million, five hundred eighteen thousand, five hundred twenty-five".