16855720945271 has 24 divisors (see below), whose sum is σ = 18415829571840. Its totient is φ = 15420119894400.

The previous prime is 16855720945253. The next prime is 16855720945303. The reversal of 16855720945271 is 17254902755861.

It is a de Polignac number, because none of the positive numbers 2^k-16855720945271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16855720945211) 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 23 ways as a sum of consecutive naturals, for example, 7712441 + ... + 9653661.

It is an arithmetic number, because the mean of its divisors is an integer number (767326232160).

Almost surely, 2^{16855720945271} is an apocalyptic number.

16855720945271 is a deficient number, since it is larger than the sum of its proper divisors (1560108626569).

16855720945271 is a wasteful number, since it uses less digits than its factorization.

16855720945271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941707 (or 1941694 counting only the distinct ones).

The product of its (nonzero) digits is 42336000, while the sum is 62.

The spelling of 16855720945271 in words is "sixteen trillion, eight hundred fifty-five billion, seven hundred twenty million, nine hundred forty-five thousand, two hundred seventy-one".