160128825921 has 9 divisors (see below), whose sum is σ = 231298927041. Its totient is φ = 106751750292.

The previous prime is 160128825893. The next prime is 160128825947. The reversal of 160128825921 is 129528821061.

The square root of 160128825921 is 400161.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 160128825921 - 2¹¹ = 160128823873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (160128825991) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1133790 + ... + 1267176.

Almost surely, 2^160128825921 is an apocalyptic number.

160128825921 is the 400161-st square number.

160128825921 is the 200081-st centered octagonal number.

It is an amenable number.

160128825921 is a deficient number, since it is larger than the sum of its proper divisors (71170101120).

160128825921 is an frugal number, since it uses more digits than its factorization.

160128825921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266780 (or 133390 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

It can be divided in two parts, 160128 and 825921, that added together give a square (986049 = 993²).

The spelling of 160128825921 in words is "one hundred sixty billion, one hundred twenty-eight million, eight hundred twenty-five thousand, nine hundred twenty-one".