71911983841 has 4 divisors (see below), whose sum is σ = 73090868884. Its totient is φ = 70733098800.

The previous prime is 71911983827. The next prime is 71911983881. The reversal of 71911983841 is 14838911917.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14838911917 = 26407 ⋅561931.

It can be written as a sum of positive squares in 2 ways, for example, as 30597356241 + 41314627600 = 174921^2 + 203260^2 .

It is a cyclic number.

It is not a de Polignac number, because 71911983841 - 2²¹ = 71909886689 is a prime.

It is a super-2 number, since 2×71911983841² (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 (71911983821) 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, 589442430 + ... + 589442551.

It is an arithmetic number, because the mean of its divisors is an integer number (18272717221).

Almost surely, 2^71911983841 is an apocalyptic number.

It is an amenable number.

71911983841 is a deficient number, since it is larger than the sum of its proper divisors (1178885043).

71911983841 is a wasteful number, since it uses less digits than its factorization.

71911983841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178885042.

The product of its digits is 435456, while the sum is 52.

The spelling of 71911983841 in words is "seventy-one billion, nine hundred eleven million, nine hundred eighty-three thousand, eight hundred forty-one".