71957561239 has 4 divisors (see below), whose sum is σ = 72005953824. Its totient is φ = 71909168656.

The previous prime is 71957561219. The next prime is 71957561341. The reversal of 71957561239 is 93216575917.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93216575917 = 18439 ⋅5055403.

It is a cyclic number.

It is not a de Polignac number, because 71957561239 - 2⁷ = 71957561111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71957561239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71957561209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24194062 + ... + 24197035.

It is an arithmetic number, because the mean of its divisors is an integer number (18001488456).

Almost surely, 2^71957561239 is an apocalyptic number.

71957561239 is a deficient number, since it is larger than the sum of its proper divisors (48392585).

71957561239 is a wasteful number, since it uses less digits than its factorization.

71957561239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48392584.

The product of its digits is 3572100, while the sum is 55.

The spelling of 71957561239 in words is "seventy-one billion, nine hundred fifty-seven million, five hundred sixty-one thousand, two hundred thirty-nine".