81296646818 has 8 divisors (see below), whose sum is σ = 125878679040. Its totient is φ = 39337087140.

The previous prime is 81296646811. The next prime is 81296646887. The reversal of 81296646818 is 81864669218.

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

It is not an unprimeable number, because it can be changed into a prime (81296646811) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 655618058 + ... + 655618181.

It is an arithmetic number, because the mean of its divisors is an integer number (15734834880).

Almost surely, 2^81296646818 is an apocalyptic number.

81296646818 is a deficient number, since it is larger than the sum of its proper divisors (44582032222).

81296646818 is a wasteful number, since it uses less digits than its factorization.

81296646818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311236272.

The product of its digits is 7962624, while the sum is 59.

The spelling of 81296646818 in words is "eighty-one billion, two hundred ninety-six million, six hundred forty-six thousand, eight hundred eighteen".