161015205289 has 9 divisors (see below), whose sum is σ = 165055055511. Its totient is φ = 157071954480.

The previous prime is 161015205283. The next prime is 161015205293. The reversal of 161015205289 is 982502510161.

The square root of 161015205289 is 401267.

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

It can be written as a sum of positive squares in only one way, i.e., 7758614889 + 153256590400 = 88083^2 + 391480^2 .

It is not a de Polignac number, because 161015205289 - 2²⁹ = 160478334377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161015205283) 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, 16447054 + ... + 16456840.

Almost surely, 2^161015205289 is an apocalyptic number.

161015205289 is the 401267-th square number.

161015205289 is the 200634-th centered octagonal number.

It is an amenable number.

161015205289 is a deficient number, since it is larger than the sum of its proper divisors (4039850222).

161015205289 is an frugal number, since it uses more digits than its factorization.

161015205289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19656 (or 9828 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 40.

The spelling of 161015205289 in words is "one hundred sixty-one billion, fifteen million, two hundred five thousand, two hundred eighty-nine".