81825613068 has 12 divisors (see below), whose sum is σ = 190926430520. Its totient is φ = 27275204352.

The previous prime is 81825613061. The next prime is 81825613081. The reversal of 81825613068 is 86031652818.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (81825613061) 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, 3409400533 + ... + 3409400556.

Almost surely, 2^81825613068 is an apocalyptic number.

It is an amenable number.

81825613068 is an abundant number, since it is smaller than the sum of its proper divisors (109100817452).

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

81825613068 is a wasteful number, since it uses less digits than its factorization.

81825613068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6818801096 (or 6818801094 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 81825613068 in words is "eighty-one billion, eight hundred twenty-five million, six hundred thirteen thousand, sixty-eight".