171666205140 has 48 divisors (see below), whose sum is σ = 481507266240. Its totient is φ = 45697474560.

The previous prime is 171666205111. The next prime is 171666205211. The reversal of 171666205140 is 41502666171.

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, 2471085 + ... + 2539604.

It is an arithmetic number, because the mean of its divisors is an integer number (10031401380).

Almost surely, 2^171666205140 is an apocalyptic number.

171666205140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

171666205140 is an abundant number, since it is smaller than the sum of its proper divisors (309841061100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171666205140 is a wasteful number, since it uses less digits than its factorization.

171666205140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5011272 (or 5011270 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 171666205140 in words is "one hundred seventy-one billion, six hundred sixty-six million, two hundred five thousand, one hundred forty".