71212112806817 has 4 divisors (see below), whose sum is σ = 72012248905860. Its totient is φ = 70411976707776.

The previous prime is 71212112806739. The next prime is 71212112806831. The reversal of 71212112806817 is 71860821121217.

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 3675997109521 + 67536115697296 = 1917289^2 + 8218036^2 .

It is a cyclic number.

It is not a de Polignac number, because 71212112806817 - 2¹⁴ = 71212112790433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71212112806837) 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, 400068049388 + ... + 400068049565.

It is an arithmetic number, because the mean of its divisors is an integer number (18003062226465).

Almost surely, 2^{71212112806817} is an apocalyptic number.

It is an amenable number.

71212112806817 is a deficient number, since it is larger than the sum of its proper divisors (800136099043).

71212112806817 is an equidigital number, since it uses as much as digits as its factorization.

71212112806817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800136099042.

The product of its (nonzero) digits is 150528, while the sum is 47.

The spelling of 71212112806817 in words is "seventy-one trillion, two hundred twelve billion, one hundred twelve million, eight hundred six thousand, eight hundred seventeen".