81683677638618 has 32 divisors (see below), whose sum is σ = 178454361055680. Its totient is φ = 24719931250560.

The previous prime is 81683677638599. The next prime is 81683677638751.

81683677638618 is nontrivially palindromic in base 10.

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, 817408083 + ... + 817508006.

It is an arithmetic number, because the mean of its divisors is an integer number (5576698782990).

Almost surely, 2^{81683677638618} is an apocalyptic number.

81683677638618 is an abundant number, since it is smaller than the sum of its proper divisors (96770683417062).

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

81683677638618 is a wasteful number, since it uses less digits than its factorization.

81683677638618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634916862.

The product of its digits is 2341011456, while the sum is 78.

The spelling of 81683677638618 in words is "eighty-one trillion, six hundred eighty-three billion, six hundred seventy-seven million, six hundred thirty-eight thousand, six hundred eighteen".