172874600161 has 4 divisors (see below), whose sum is σ = 178835793300. Its totient is φ = 166913407024.

The previous prime is 172874600153. The next prime is 172874600203. The reversal of 172874600161 is 161006478271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82728140625 + 90146459536 = 287625^2 + 300244^2 .

It is a cyclic number.

It is not a de Polignac number, because 172874600161 - 2³ = 172874600153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172874600141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2980596526 + ... + 2980596583.

It is an arithmetic number, because the mean of its divisors is an integer number (44708948325).

Almost surely, 2^172874600161 is an apocalyptic number.

It is an amenable number.

172874600161 is a deficient number, since it is larger than the sum of its proper divisors (5961193139).

172874600161 is an equidigital number, since it uses as much as digits as its factorization.

172874600161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5961193138.

The product of its (nonzero) digits is 112896, while the sum is 43.

The spelling of 172874600161 in words is "one hundred seventy-two billion, eight hundred seventy-four million, six hundred thousand, one hundred sixty-one".