71843128525 has 24 divisors (see below), whose sum is σ = 105096241664. Its totient is φ = 47674699200.

The previous prime is 71843128523. The next prime is 71843128543. The reversal of 71843128525 is 52582134817.

It is a happy number.

It is not a de Polignac number, because 71843128525 - 2¹ = 71843128523 is a prime.

It is a super-2 number, since 2×71843128525² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71843128523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6616062 + ... + 6626911.

Almost surely, 2^71843128525 is an apocalyptic number.

It is an amenable number.

71843128525 is a deficient number, since it is larger than the sum of its proper divisors (33253113139).

71843128525 is a wasteful number, since it uses less digits than its factorization.

71843128525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13243021 (or 13243016 counting only the distinct ones).

The product of its digits is 537600, while the sum is 46.

The spelling of 71843128525 in words is "seventy-one billion, eight hundred forty-three million, one hundred twenty-eight thousand, five hundred twenty-five".