161207142171 has 16 divisors (see below), whose sum is σ = 215859143808. Its totient is φ = 107014089600.

The previous prime is 161207142149. The next prime is 161207142181. The reversal of 161207142171 is 171241702161.

It is not a de Polignac number, because 161207142171 - 2⁹ = 161207141659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161207142181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 705235 + ... + 905411.

It is an arithmetic number, because the mean of its divisors is an integer number (13491196488).

Almost surely, 2^161207142171 is an apocalyptic number.

161207142171 is a deficient number, since it is larger than the sum of its proper divisors (54652001637).

161207142171 is a wasteful number, since it uses less digits than its factorization.

161207142171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201322.

The product of its (nonzero) digits is 4704, while the sum is 33.

The spelling of 161207142171 in words is "one hundred sixty-one billion, two hundred seven million, one hundred forty-two thousand, one hundred seventy-one".