81340814748 has 12 divisors (see below), whose sum is σ = 189795234440. Its totient is φ = 27113604912.

The previous prime is 81340814717. The next prime is 81340814761. The reversal of 81340814748 is 84741804318.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 81340814697 and 81340814706.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 3389200603 + ... + 3389200626.

Almost surely, 2^81340814748 is an apocalyptic number.

It is an amenable number.

81340814748 is an abundant number, since it is smaller than the sum of its proper divisors (108454419692).

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

81340814748 is a wasteful number, since it uses less digits than its factorization.

81340814748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6778401236 (or 6778401234 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 48.

The spelling of 81340814748 in words is "eighty-one billion, three hundred forty million, eight hundred fourteen thousand, seven hundred forty-eight".