16851836836872 has 384 divisors, whose sum is σ = 51681017606400. Its totient is φ = 4929196032000.

The previous prime is 16851836836867. The next prime is 16851836836949. The reversal of 16851836836872 is 27863863815861.

16851836836872 is a `hidden beast` number, since 1 + 6 + 8 + 518 + 3 + 6 + 8 + 36 + 8 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 16851836836872.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 392237472 + ... + 392280432.

It is an arithmetic number, because the mean of its divisors is an integer number (134585983350).

Almost surely, 2^{16851836836872} is an apocalyptic number.

16851836836872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16851836836872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25840508803200).

16851836836872 is an abundant number, since it is smaller than the sum of its proper divisors (34829180769528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16851836836872 is a wasteful number, since it uses less digits than its factorization.

16851836836872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43277 (or 43270 counting only the distinct ones).

The product of its digits is 557383680, while the sum is 72.

The spelling of 16851836836872 in words is "sixteen trillion, eight hundred fifty-one billion, eight hundred thirty-six million, eight hundred thirty-six thousand, eight hundred seventy-two".