71144444681 has 4 divisors (see below), whose sum is σ = 71421271572. Its totient is φ = 70867617792.

The previous prime is 71144444669. The next prime is 71144444837. The reversal of 71144444681 is 18644444117.

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

It can be written as a sum of positive squares in 2 ways, for example, as 70756000000 + 388444681 = 266000^2 + 19709^2 .

It is a cyclic number.

It is not a de Polignac number, because 71144444681 - 2⁶ = 71144444617 is a prime.

It is a super-2 number, since 2×71144444681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71144444981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138413060 + ... + 138413573.

It is an arithmetic number, because the mean of its divisors is an integer number (17855317893).

Almost surely, 2^71144444681 is an apocalyptic number.

It is an amenable number.

71144444681 is a deficient number, since it is larger than the sum of its proper divisors (276826891).

71144444681 is a wasteful number, since it uses less digits than its factorization.

71144444681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276826890.

The product of its digits is 344064, while the sum is 44.

Adding to 71144444681 its reverse (18644444117), we get a palindrome (89788888798).

The spelling of 71144444681 in words is "seventy-one billion, one hundred forty-four million, four hundred forty-four thousand, six hundred eighty-one".