71891544053 has 4 divisors (see below), whose sum is σ = 82161764640. Its totient is φ = 61621323468.

The previous prime is 71891544041. The next prime is 71891544059. The reversal of 71891544053 is 35044519817.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71891544053 - 2²² = 71887349749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71891543989 and 71891544007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71891544059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5135110283 + ... + 5135110296.

It is an arithmetic number, because the mean of its divisors is an integer number (20540441160).

Almost surely, 2^71891544053 is an apocalyptic number.

It is an amenable number.

71891544053 is a deficient number, since it is larger than the sum of its proper divisors (10270220587).

71891544053 is a wasteful number, since it uses less digits than its factorization.

71891544053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10270220586.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 71891544053 in words is "seventy-one billion, eight hundred ninety-one million, five hundred forty-four thousand, fifty-three".