16681831656 has 48 divisors (see below), whose sum is σ = 48513493440. Its totient is φ = 4766237280.

The previous prime is 16681831651. The next prime is 16681831681. The reversal of 16681831656 is 65613818661.

It is a junction number, because it is equal to n+sod(n) for n = 16681831599 and 16681831608.

It is not an unprimeable number, because it can be changed into a prime (16681831651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7091440 + ... + 7093791.

It is an arithmetic number, because the mean of its divisors is an integer number (1010697780).

Almost surely, 2^16681831656 is an apocalyptic number.

It is an amenable number.

16681831656 is an abundant number, since it is smaller than the sum of its proper divisors (31831661784).

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

16681831656 is a wasteful number, since it uses less digits than its factorization.

16681831656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14185254 (or 14185243 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 51.

The spelling of 16681831656 in words is "sixteen billion, six hundred eighty-one million, eight hundred thirty-one thousand, six hundred fifty-six".