81340746748 has 12 divisors (see below), whose sum is σ = 143301652200. Its totient is φ = 40397417552.

The previous prime is 81340746743. The next prime is 81340746749. The reversal of 81340746748 is 84764704318.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81340746695 and 81340746704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81340746743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68238286 + ... + 68239477.

It is an arithmetic number, because the mean of its divisors is an integer number (11941804350).

Almost surely, 2^81340746748 is an apocalyptic number.

It is an amenable number.

81340746748 is a deficient number, since it is larger than the sum of its proper divisors (61960905452).

81340746748 is a wasteful number, since it uses less digits than its factorization.

81340746748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136477916 (or 136477914 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 52.

The spelling of 81340746748 in words is "eighty-one billion, three hundred forty million, seven hundred forty-six thousand, seven hundred forty-eight".