71856237613 has 8 divisors (see below), whose sum is σ = 74658648600. Its totient is φ = 69075467328.

The previous prime is 71856237611. The next prime is 71856237631. The reversal of 71856237613 is 31673265817.

It can be written as a sum of positive squares in 4 ways, for example, as 24198291364 + 47657946249 = 155558^2 + 218307^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71856237613 - 2¹ = 71856237611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71856237611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5403406 + ... + 5416687.

It is an arithmetic number, because the mean of its divisors is an integer number (9332331075).

Almost surely, 2^71856237613 is an apocalyptic number.

It is an amenable number.

71856237613 is a deficient number, since it is larger than the sum of its proper divisors (2802410987).

71856237613 is a wasteful number, since it uses less digits than its factorization.

71856237613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10820351.

The product of its digits is 1270080, while the sum is 49.

The spelling of 71856237613 in words is "seventy-one billion, eight hundred fifty-six million, two hundred thirty-seven thousand, six hundred thirteen".