81074440140447 has 16 divisors (see below), whose sum is σ = 117722609716320. Its totient is φ = 49331379305472.

The previous prime is 81074440140437. The next prime is 81074440140479. The reversal of 81074440140447 is 74404104447018.

It is not a de Polignac number, because 81074440140447 - 2⁶ = 81074440140383 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81074440140396 and 81074440140405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81074440140437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11678826858 + ... + 11678833799.

It is an arithmetic number, because the mean of its divisors is an integer number (7357663107270).

Almost surely, 2^{81074440140447} is an apocalyptic number.

81074440140447 is a deficient number, since it is larger than the sum of its proper divisors (36648169575873).

81074440140447 is a wasteful number, since it uses less digits than its factorization.

81074440140447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23357660762.

The product of its (nonzero) digits is 1605632, while the sum is 48.

The spelling of 81074440140447 in words is "eighty-one trillion, seventy-four billion, four hundred forty million, one hundred forty thousand, four hundred forty-seven".