71712022057217 has 4 divisors (see below), whose sum is σ = 71991057162756. Its totient is φ = 71432986951680.

The previous prime is 71712022057177. The next prime is 71712022057243. The reversal of 71712022057217 is 71275022021717.

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 53531699039296 + 18180323017921 = 7316536^2 + 4263839^2 .

It is a cyclic number.

It is not a de Polignac number, because 71712022057217 - 2⁶ = 71712022057153 is a prime.

It is a super-2 number, since 2×71712022057217² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71712022050217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139517552384 + ... + 139517552897.

It is an arithmetic number, because the mean of its divisors is an integer number (17997764290689).

Almost surely, 2^{71712022057217} is an apocalyptic number.

It is an amenable number.

71712022057217 is a deficient number, since it is larger than the sum of its proper divisors (279035105539).

71712022057217 is a wasteful number, since it uses less digits than its factorization.

71712022057217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279035105538.

The product of its (nonzero) digits is 192080, while the sum is 44.

The spelling of 71712022057217 in words is "seventy-one trillion, seven hundred twelve billion, twenty-two million, fifty-seven thousand, two hundred seventeen".