16685001666851 has 12 divisors (see below), whose sum is σ = 20035183043520. Its totient is φ = 13840093547280.

The previous prime is 16685001666833. The next prime is 16685001666857. The reversal of 16685001666851 is 15866610058661.

It is a de Polignac number, because none of the positive numbers 2^k-16685001666851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16685001666857) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 5492099096 + ... + 5492102133.

It is an arithmetic number, because the mean of its divisors is an integer number (1669598586960).

Almost surely, 2^{16685001666851} is an apocalyptic number.

16685001666851 is a deficient number, since it is larger than the sum of its proper divisors (3350181376669).

16685001666851 is a wasteful number, since it uses less digits than its factorization.

16685001666851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10984201274 (or 10984201267 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 59.

The spelling of 16685001666851 in words is "sixteen trillion, six hundred eighty-five billion, one million, six hundred sixty-six thousand, eight hundred fifty-one".