71643657943 has 16 divisors (see below), whose sum is σ = 85756872096. Its totient is φ = 58986195840.

The previous prime is 71643657919. The next prime is 71643657977. The reversal of 71643657943 is 34975634617.

It is a de Polignac number, because none of the positive numbers 2^k-71643657943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71643657913) 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, 4718880 + ... + 4734037.

It is an arithmetic number, because the mean of its divisors is an integer number (5359804506).

Almost surely, 2^71643657943 is an apocalyptic number.

71643657943 is a deficient number, since it is larger than the sum of its proper divisors (14113214153).

71643657943 is a wasteful number, since it uses less digits than its factorization.

71643657943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9452994.

The product of its digits is 11430720, while the sum is 55.

The spelling of 71643657943 in words is "seventy-one billion, six hundred forty-three million, six hundred fifty-seven thousand, nine hundred forty-three".