671555617271 has 32 divisors (see below), whose sum is σ = 857897356800. Its totient is φ = 521118057600.

The previous prime is 671555617231. The next prime is 671555617289. The reversal of 671555617271 is 172716555176.

It is a happy number.

It is not a de Polignac number, because 671555617271 - 2¹⁰ = 671555616247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671555617231) 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 31 ways as a sum of consecutive naturals, for example, 540020 + ... + 1278566.

It is an arithmetic number, because the mean of its divisors is an integer number (26809292400).

Almost surely, 2^671555617271 is an apocalyptic number.

671555617271 is a deficient number, since it is larger than the sum of its proper divisors (186341739529).

671555617271 is a wasteful number, since it uses less digits than its factorization.

671555617271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738820 (or 738806 counting only the distinct ones).

The product of its digits is 3087000, while the sum is 53.

The spelling of 671555617271 in words is "six hundred seventy-one billion, five hundred fifty-five million, six hundred seventeen thousand, two hundred seventy-one".