16856915999 has 8 divisors (see below), whose sum is σ = 21016414848. Its totient is φ = 13135259160.

The previous prime is 16856915969. The next prime is 16856916067. The reversal of 16856915999 is 99951965861.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16856915999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16856915939) 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, 109460417 + ... + 109460570.

It is an arithmetic number, because the mean of its divisors is an integer number (2627051856).

Almost surely, 2^16856915999 is an apocalyptic number.

16856915999 is a deficient number, since it is larger than the sum of its proper divisors (4159498849).

16856915999 is a wasteful number, since it uses less digits than its factorization.

16856915999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218921005.

The product of its digits is 47239200, while the sum is 68.

The spelling of 16856915999 in words is "sixteen billion, eight hundred fifty-six million, nine hundred fifteen thousand, nine hundred ninety-nine".