81846864818 has 16 divisors (see below), whose sum is σ = 123102633600. Its totient is φ = 40812751056.

The previous prime is 81846864793. The next prime is 81846864833.

81846864818 is nontrivially palindromic in base 10.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1742708 + ... + 1789056.

It is an arithmetic number, because the mean of its divisors is an integer number (7693914600).

Almost surely, 2^81846864818 is an apocalyptic number.

81846864818 is a deficient number, since it is larger than the sum of its proper divisors (41255768782).

81846864818 is a wasteful number, since it uses less digits than its factorization.

81846864818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48721.

The product of its digits is 18874368, while the sum is 62.

The spelling of 81846864818 in words is "eighty-one billion, eight hundred forty-six million, eight hundred sixty-four thousand, eight hundred eighteen".