161555107171 has 8 divisors (see below), whose sum is σ = 162236716544. Its totient is φ = 160874932680.

The previous prime is 161555107169. The next prime is 161555107177. The reversal of 161555107171 is 171701555161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161555107171 - 2¹ = 161555107169 is a prime.

It is a super-2 number, since 2×161555107171² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161555107177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132765 + ... + 583726.

It is an arithmetic number, because the mean of its divisors is an integer number (20279589568).

Almost surely, 2^161555107171 is an apocalyptic number.

161555107171 is a deficient number, since it is larger than the sum of its proper divisors (681609373).

161555107171 is an equidigital number, since it uses as much as digits as its factorization.

161555107171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717441.

The product of its (nonzero) digits is 36750, while the sum is 40.

The spelling of 161555107171 in words is "one hundred sixty-one billion, five hundred fifty-five million, one hundred seven thousand, one hundred seventy-one".