81986466468918 has 64 divisors (see below), whose sum is σ = 183175287432192. Its totient is φ = 24250589767680.

The previous prime is 81986466468911. The next prime is 81986466468941.

81986466468918 is nontrivially palindromic in base 10.

81986466468918 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81986466468911) 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 31 ways as a sum of consecutive naturals, for example, 34272171 + ... + 36586262.

It is an arithmetic number, because the mean of its divisors is an integer number (2862113866128).

Almost surely, 2^{81986466468918} is an apocalyptic number.

81986466468918 is an abundant number, since it is smaller than the sum of its proper divisors (101188820963274).

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

81986466468918 is a wasteful number, since it uses less digits than its factorization.

81986466468918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70858869.

The product of its digits is 6879707136, while the sum is 84.

The spelling of 81986466468918 in words is "eighty-one trillion, nine hundred eighty-six billion, four hundred sixty-six million, four hundred sixty-eight thousand, nine hundred eighteen".