71911658385 has 48 divisors (see below), whose sum is σ = 148715280000. Its totient is φ = 32873897952.

The previous prime is 71911658323. The next prime is 71911658443. The reversal of 71911658385 is 58385611917.

It is a happy number.

It is not a de Polignac number, because 71911658385 - 2¹² = 71911654289 is a prime.

It is a super-2 number, since 2×71911658385² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 5428885 + ... + 5442114.

It is an arithmetic number, because the mean of its divisors is an integer number (3098235000).

Almost surely, 2^71911658385 is an apocalyptic number.

It is an amenable number.

71911658385 is an abundant number, since it is smaller than the sum of its proper divisors (76803621615).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71911658385 is a wasteful number, since it uses less digits than its factorization.

71911658385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10871027 (or 10871014 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 54.

The spelling of 71911658385 in words is "seventy-one billion, nine hundred eleven million, six hundred fifty-eight thousand, three hundred eighty-five".