671171312505 has 16 divisors (see below), whose sum is σ = 1084300064640. Its totient is φ = 354482711808.

The previous prime is 671171312503. The next prime is 671171312507. The reversal of 671171312505 is 505213171176.

It is an interprime number because it is at equal distance from previous prime (671171312503) and next prime (671171312507).

It is not a de Polignac number, because 671171312505 - 2¹ = 671171312503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671171312503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217206000 + ... + 217209089.

It is an arithmetic number, because the mean of its divisors is an integer number (67768754040).

Almost surely, 2^671171312505 is an apocalyptic number.

It is an amenable number.

671171312505 is a deficient number, since it is larger than the sum of its proper divisors (413128752135).

671171312505 is a wasteful number, since it uses less digits than its factorization.

671171312505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434415200.

The product of its (nonzero) digits is 44100, while the sum is 39.

The spelling of 671171312505 in words is "six hundred seventy-one billion, one hundred seventy-one million, three hundred twelve thousand, five hundred five".