671171470720217 has 4 divisors (see below), whose sum is σ = 671398755339060. Its totient is φ = 670944186101376.

The previous prime is 671171470720213. The next prime is 671171470720243. The reversal of 671171470720217 is 712027074171176.

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 626974356775936 + 44197113944281 = 25039456^2 + 6648091^2 .

It is a cyclic number.

It is not a de Polignac number, because 671171470720217 - 2² = 671171470720213 is a prime.

It is a super-2 number, since 2×671171470720217² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671171470720213) 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, 113642304992 + ... + 113642310897.

It is an arithmetic number, because the mean of its divisors is an integer number (167849688834765).

Almost surely, 2^{671171470720217} is an apocalyptic number.

It is an amenable number.

671171470720217 is a deficient number, since it is larger than the sum of its proper divisors (227284618843).

671171470720217 is a wasteful number, since it uses less digits than its factorization.

671171470720217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227284618842.

The product of its (nonzero) digits is 1613472, while the sum is 53.

The spelling of 671171470720217 in words is "six hundred seventy-one trillion, one hundred seventy-one billion, four hundred seventy million, seven hundred twenty thousand, two hundred seventeen".