161380399173 has 16 divisors (see below), whose sum is σ = 246004936320. Its totient is φ = 92182890816.

The previous prime is 161380399157. The next prime is 161380399181. The reversal of 161380399173 is 371993083161.

It is not a de Polignac number, because 161380399173 - 2⁴ = 161380399157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161380399183) 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, 1379118 + ... + 1491551.

It is an arithmetic number, because the mean of its divisors is an integer number (15375308520).

Almost surely, 2^161380399173 is an apocalyptic number.

It is an amenable number.

161380399173 is a deficient number, since it is larger than the sum of its proper divisors (84624537147).

161380399173 is a wasteful number, since it uses less digits than its factorization.

161380399173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873356.

The product of its (nonzero) digits is 734832, while the sum is 51.

The spelling of 161380399173 in words is "one hundred sixty-one billion, three hundred eighty million, three hundred ninety-nine thousand, one hundred seventy-three".