81744677644718 has 16 divisors (see below), whose sum is σ = 133773844651056. Its totient is φ = 37153942021440.

The previous prime is 81744677644717. The next prime is 81744677644793.

81744677644718 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81744677644717) 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 7 ways as a sum of consecutive naturals, for example, 136175471 + ... + 136774442.

It is an arithmetic number, because the mean of its divisors is an integer number (8360865290691).

Almost surely, 2^{81744677644718} is an apocalyptic number.

81744677644718 is a deficient number, since it is larger than the sum of its proper divisors (52029167006338).

81744677644718 is a wasteful number, since it uses less digits than its factorization.

81744677644718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272963539.

The product of its digits is 1416167424, while the sum is 74.

The spelling of 81744677644718 in words is "eighty-one trillion, seven hundred forty-four billion, six hundred seventy-seven million, six hundred forty-four thousand, seven hundred eighteen".