71538644281 has 8 divisors (see below), whose sum is σ = 77090678784. Its totient is φ = 65993618640.

The previous prime is 71538644267. The next prime is 71538644339. The reversal of 71538644281 is 18244683517.

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 71538644281 - 2⁵ = 71538644249 is a prime.

It is a super-3 number, since 3×71538644281³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71538644201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1731001 + ... + 1771846.

It is an arithmetic number, because the mean of its divisors is an integer number (9636334848).

Almost surely, 2^71538644281 is an apocalyptic number.

It is an amenable number.

71538644281 is a deficient number, since it is larger than the sum of its proper divisors (5552034503).

71538644281 is a wasteful number, since it uses less digits than its factorization.

71538644281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3504431.

The product of its digits is 1290240, while the sum is 49.

The spelling of 71538644281 in words is "seventy-one billion, five hundred thirty-eight million, six hundred forty-four thousand, two hundred eighty-one".