71583309473 has 4 divisors (see below), whose sum is σ = 77089717908. Its totient is φ = 66076901040.

The previous prime is 71583309467. The next prime is 71583309491. The reversal of 71583309473 is 37490338517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37490338517 = 45587 ⋅822391.

It can be written as a sum of positive squares in 2 ways, for example, as 40389744784 + 31193564689 = 200972^2 + 176617^2 .

It is a cyclic number.

It is not a de Polignac number, because 71583309473 - 2¹² = 71583305377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71583309673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2753204198 + ... + 2753204223.

It is an arithmetic number, because the mean of its divisors is an integer number (19272429477).

Almost surely, 2^71583309473 is an apocalyptic number.

It is an amenable number.

71583309473 is a deficient number, since it is larger than the sum of its proper divisors (5506408435).

71583309473 is a wasteful number, since it uses less digits than its factorization.

71583309473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5506408434.

The product of its (nonzero) digits is 1905120, while the sum is 50.

The spelling of 71583309473 in words is "seventy-one billion, five hundred eighty-three million, three hundred nine thousand, four hundred seventy-three".