71443643717 has 4 divisors (see below), whose sum is σ = 74549889120. Its totient is φ = 68337398316.

The previous prime is 71443643699. The next prime is 71443643729. The reversal of 71443643717 is 71734634417.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71734634417 = 1747 ⋅41061611.

It is a cyclic number.

It is not a de Polignac number, because 71443643717 - 2¹⁶ = 71443578181 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 (71443643737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1553122667 + ... + 1553122712.

It is an arithmetic number, because the mean of its divisors is an integer number (18637472280).

Almost surely, 2^71443643717 is an apocalyptic number.

It is an amenable number.

71443643717 is a deficient number, since it is larger than the sum of its proper divisors (3106245403).

71443643717 is a wasteful number, since it uses less digits than its factorization.

71443643717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106245402.

The product of its digits is 1185408, while the sum is 47.

The spelling of 71443643717 in words is "seventy-one billion, four hundred forty-three million, six hundred forty-three thousand, seven hundred seventeen".