16851853666681 has 8 divisors (see below), whose sum is σ = 18385215839424. Its totient is φ = 15318720739920.

The previous prime is 16851853666589. The next prime is 16851853666693. The reversal of 16851853666681 is 18666635815861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16851853666681 - 2⁴¹ = 14652830411129 is a prime.

It is a super-2 number, since 2×16851853666681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16851853666681.

It is not an unprimeable number, because it can be changed into a prime (16851853616681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57157770 + ... + 57451843.

It is an arithmetic number, because the mean of its divisors is an integer number (2298151979928).

Almost surely, 2^{16851853666681} is an apocalyptic number.

16851853666681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16851853666681 is a deficient number, since it is larger than the sum of its proper divisors (1533362172743).

16851853666681 is a wasteful number, since it uses less digits than its factorization.

16851853666681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114622991.

The product of its digits is 298598400, while the sum is 70.

The spelling of 16851853666681 in words is "sixteen trillion, eight hundred fifty-one billion, eight hundred fifty-three million, six hundred sixty-six thousand, six hundred eighty-one".