81167885012 has 48 divisors (see below), whose sum is σ = 151298280000. Its totient is φ = 37991188224.

The previous prime is 81167885003. The next prime is 81167885021. The reversal of 81167885012 is 21058876118.

It is an interprime number because it is at equal distance from previous prime (81167885003) and next prime (81167885021).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14194778 + ... + 14200494.

It is an arithmetic number, because the mean of its divisors is an integer number (3152047500).

Almost surely, 2^81167885012 is an apocalyptic number.

It is an amenable number.

81167885012 is a deficient number, since it is larger than the sum of its proper divisors (70130394988).

81167885012 is a wasteful number, since it uses less digits than its factorization.

81167885012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7928 (or 7926 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 47.

The spelling of 81167885012 in words is "eighty-one billion, one hundred sixty-seven million, eight hundred eighty-five thousand, twelve".