71330128013 has 4 divisors (see below), whose sum is σ = 71330965980. Its totient is φ = 71329290048.

The previous prime is 71330127949. The next prime is 71330128033. The reversal of 71330128013 is 31082103317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31082103317 = 127 ⋅244740971.

It can be written as a sum of positive squares in 2 ways, for example, as 69969772324 + 1360355689 = 264518^2 + 36883^2 .

It is a cyclic number.

It is not a de Polignac number, because 71330128013 - 2⁶ = 71330127949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71330128033) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 274748 + ... + 467061.

It is an arithmetic number, because the mean of its divisors is an integer number (17832741495).

Almost surely, 2^71330128013 is an apocalyptic number.

It is an amenable number.

71330128013 is a deficient number, since it is larger than the sum of its proper divisors (837967).

71330128013 is an equidigital number, since it uses as much as digits as its factorization.

71330128013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837966.

The product of its (nonzero) digits is 3024, while the sum is 29.

The spelling of 71330128013 in words is "seventy-one billion, three hundred thirty million, one hundred twenty-eight thousand, thirteen".