142605172161 has 15 divisors (see below), whose sum is σ = 213032556561. Its totient is φ = 95067848988.

The previous prime is 142605172159. The next prime is 142605172169. The reversal of 142605172161 is 161271506241.

The square root of 142605172161 is 377631.

It is a perfect power (a square), and thus also a powerful number.

142605172161 is a `hidden beast` number, since 1 + 4 + 2 + 60 + 517 + 21 + 61 = 666.

It is not a de Polignac number, because 142605172161 - 2¹ = 142605172159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142605172169) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 3377700 + ... + 3419658.

Almost surely, 2^142605172161 is an apocalyptic number.

142605172161 is the 377631-st square number.

142605172161 is the 188816-th centered octagonal number.

It is an amenable number.

142605172161 is a deficient number, since it is larger than the sum of its proper divisors (70427384400).

142605172161 is an frugal number, since it uses more digits than its factorization.

142605172161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83930 (or 41962 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

Multiplying 142605172161 by its sum of digits (36), we get a square (5133786197796 = 2265786²).

The spelling of 142605172161 in words is "one hundred forty-two billion, six hundred five million, one hundred seventy-two thousand, one hundred sixty-one".