71234643217 has 4 divisors (see below), whose sum is σ = 71249794560. Its totient is φ = 71219491876.

The previous prime is 71234643167. The next prime is 71234643239.

71234643217 is nontrivially palindromic in base 10.

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 71234643217 - 2³¹ = 69087159569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71234643217.

It is not an unprimeable number, because it can be changed into a prime (71234643247) 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, 7568617 + ... + 7578022.

It is an arithmetic number, because the mean of its divisors is an integer number (17812448640).

Almost surely, 2^71234643217 is an apocalyptic number.

It is an amenable number.

71234643217 is a deficient number, since it is larger than the sum of its proper divisors (15151343).

71234643217 is a wasteful number, since it uses less digits than its factorization.

71234643217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15151342.

The product of its digits is 169344, while the sum is 40.

The spelling of 71234643217 in words is "seventy-one billion, two hundred thirty-four million, six hundred forty-three thousand, two hundred seventeen".