81734055647 has 4 divisors (see below), whose sum is σ = 83943084216. Its totient is φ = 79525027080.

The previous prime is 81734055631. The next prime is 81734055691. The reversal of 81734055647 is 74655043718.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81734055647 - 2⁴ = 81734055631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81734055595 and 81734055604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81734055617) by changing a digit.

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, 1104514229 + ... + 1104514302.

It is an arithmetic number, because the mean of its divisors is an integer number (20985771054).

Almost surely, 2^81734055647 is an apocalyptic number.

81734055647 is a deficient number, since it is larger than the sum of its proper divisors (2209028569).

81734055647 is a wasteful number, since it uses less digits than its factorization.

81734055647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209028568.

The product of its (nonzero) digits is 2822400, while the sum is 50.

The spelling of 81734055647 in words is "eighty-one billion, seven hundred thirty-four million, fifty-five thousand, six hundred forty-seven".