81163706876 has 48 divisors (see below), whose sum is σ = 164822676480. Its totient is φ = 34253668800.

The previous prime is 81163706867. The next prime is 81163706879. The reversal of 81163706876 is 67860736118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81163706879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415901 + ... + 579051.

It is an arithmetic number, because the mean of its divisors is an integer number (3433805760).

Almost surely, 2^81163706876 is an apocalyptic number.

It is an amenable number.

81163706876 is an abundant number, since it is smaller than the sum of its proper divisors (83658969604).

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

81163706876 is a wasteful number, since it uses less digits than its factorization.

81163706876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163434 (or 163432 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 81163706876 in words is "eighty-one billion, one hundred sixty-three million, seven hundred six thousand, eight hundred seventy-six".