16856828215 has 24 divisors (see below), whose sum is σ = 21641488848. Its totient is φ = 12600593280.

The previous prime is 16856828213. The next prime is 16856828249. The reversal of 16856828215 is 51282865861.

It is not a de Polignac number, because 16856828215 - 2¹ = 16856828213 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 (16856828213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67800 + ... + 195730.

It is an arithmetic number, because the mean of its divisors is an integer number (901728702).

Almost surely, 2^16856828215 is an apocalyptic number.

16856828215 is a deficient number, since it is larger than the sum of its proper divisors (4784660633).

16856828215 is a wasteful number, since it uses less digits than its factorization.

16856828215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128047 (or 128028 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 52.

The spelling of 16856828215 in words is "sixteen billion, eight hundred fifty-six million, eight hundred twenty-eight thousand, two hundred fifteen".