71585721443 has 4 divisors (see below), whose sum is σ = 71699170128. Its totient is φ = 71472272760.

The previous prime is 71585721421. The next prime is 71585721491. The reversal of 71585721443 is 34412758517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34412758517 = 35569 ⋅967493.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71585721443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71585721043) 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, 56723396 + ... + 56724657.

It is an arithmetic number, because the mean of its divisors is an integer number (17924792532).

Almost surely, 2^71585721443 is an apocalyptic number.

71585721443 is a deficient number, since it is larger than the sum of its proper divisors (113448685).

71585721443 is a wasteful number, since it uses less digits than its factorization.

71585721443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113448684.

The product of its digits is 940800, while the sum is 47.

The spelling of 71585721443 in words is "seventy-one billion, five hundred eighty-five million, seven hundred twenty-one thousand, four hundred forty-three".