71896144517 has 4 divisors (see below), whose sum is σ = 73839283596. Its totient is φ = 69953005440.

The previous prime is 71896144511. The next prime is 71896144549. The reversal of 71896144517 is 71544169817.

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

It can be written as a sum of positive squares in 2 ways, for example, as 65953430596 + 5942713921 = 256814^2 + 77089^2 .

It is a cyclic number.

It is not a de Polignac number, because 71896144517 - 2⁴ = 71896144501 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 (71896144511) 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, 971569484 + ... + 971569557.

It is an arithmetic number, because the mean of its divisors is an integer number (18459820899).

Almost surely, 2^71896144517 is an apocalyptic number.

It is an amenable number.

71896144517 is a deficient number, since it is larger than the sum of its proper divisors (1943139079).

71896144517 is a wasteful number, since it uses less digits than its factorization.

71896144517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943139078.

The product of its digits is 1693440, while the sum is 53.

The spelling of 71896144517 in words is "seventy-one billion, eight hundred ninety-six million, one hundred forty-four thousand, five hundred seventeen".