816169688896 has 28 divisors (see below), whose sum is σ = 1619807446180. Its totient is φ = 408029230080.

The previous prime is 816169688891. The next prime is 816169688921. The reversal of 816169688896 is 698886961618.

It can be written as a sum of positive squares in 2 ways, for example, as 759449503296 + 56720185600 = 871464^2 + 238160^2 .

It is a super-2 number, since 2×816169688896² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816169688891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393675 + ... + 1336906.

It is an arithmetic number, because the mean of its divisors is an integer number (57850265935).

Almost surely, 2^816169688896 is an apocalyptic number.

It is an amenable number.

816169688896 is a deficient number, since it is larger than the sum of its proper divisors (803637757284).

816169688896 is a wasteful number, since it uses less digits than its factorization.

816169688896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737962 (or 1737952 counting only the distinct ones).

The product of its digits is 429981696, while the sum is 76.

The spelling of 816169688896 in words is "eight hundred sixteen billion, one hundred sixty-nine million, six hundred eighty-eight thousand, eight hundred ninety-six".