161372817305 has 16 divisors (see below), whose sum is σ = 234329604480. Its totient is φ = 104146490112.

The previous prime is 161372817253. The next prime is 161372817317. The reversal of 161372817305 is 503718273161.

It is not a de Polignac number, because 161372817305 - 2²⁰ = 161371768729 is a prime.

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, 135606815 + ... + 135608004.

It is an arithmetic number, because the mean of its divisors is an integer number (14645600280).

Almost surely, 2^161372817305 is an apocalyptic number.

It is an amenable number.

161372817305 is a deficient number, since it is larger than the sum of its proper divisors (72956787175).

161372817305 is a wasteful number, since it uses less digits than its factorization.

161372817305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271214848.

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 161372817305 in words is "one hundred sixty-one billion, three hundred seventy-two million, eight hundred seventeen thousand, three hundred five".