81218239314 has 8 divisors (see below), whose sum is σ = 162436478640. Its totient is φ = 27072746436.

The previous prime is 81218239253. The next prime is 81218239321. The reversal of 81218239314 is 41393281218.

It is a sphenic number, since it is the product of 3 distinct primes.

81218239314 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6768186604 + ... + 6768186615.

It is an arithmetic number, because the mean of its divisors is an integer number (20304559830).

Almost surely, 2^81218239314 is an apocalyptic number.

81218239314 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81218239314 is a wasteful number, since it uses less digits than its factorization.

81218239314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13536373224.

The product of its digits is 82944, while the sum is 42.

The spelling of 81218239314 in words is "eighty-one billion, two hundred eighteen million, two hundred thirty-nine thousand, three hundred fourteen".