71139438551 has 4 divisors (see below), whose sum is σ = 71592556152. Its totient is φ = 70686320952.

The previous prime is 71139438547. The next prime is 71139438553. The reversal of 71139438551 is 15583493117.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71139438551 - 2² = 71139438547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71139438496 and 71139438505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71139438553) 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, 226558565 + ... + 226558878.

It is an arithmetic number, because the mean of its divisors is an integer number (17898139038).

Almost surely, 2^71139438551 is an apocalyptic number.

71139438551 is a deficient number, since it is larger than the sum of its proper divisors (453117601).

71139438551 is a wasteful number, since it uses less digits than its factorization.

71139438551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453117600.

The product of its digits is 453600, while the sum is 47.

The spelling of 71139438551 in words is "seventy-one billion, one hundred thirty-nine million, four hundred thirty-eight thousand, five hundred fifty-one".