671121071165 has 16 divisors (see below), whose sum is σ = 817292032128. Its totient is φ = 528985281216.

The previous prime is 671121071081. The next prime is 671121071189. The reversal of 671121071165 is 561170121176.

It is a cyclic number.

It is not a de Polignac number, because 671121071165 - 2²⁶ = 671053962301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3206027 + ... + 3408936.

It is an arithmetic number, because the mean of its divisors is an integer number (51080752008).

Almost surely, 2^671121071165 is an apocalyptic number.

It is an amenable number.

671121071165 is a deficient number, since it is larger than the sum of its proper divisors (146170960963).

671121071165 is a wasteful number, since it uses less digits than its factorization.

671121071165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6615268.

The product of its (nonzero) digits is 17640, while the sum is 38.

The spelling of 671121071165 in words is "six hundred seventy-one billion, one hundred twenty-one million, seventy-one thousand, one hundred sixty-five".