161586369 has 18 divisors (see below), whose sum is σ = 271509810. Its totient is φ = 92334816.

The previous prime is 161586367. The next prime is 161586401. The reversal of 161586369 is 963685161.

161586369 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 8 + 636 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 157176369 + 4410000 = 12537^2 + 2100^2 .

It is not a de Polignac number, because 161586369 - 2¹ = 161586367 is a prime.

It is a super-2 number, since 2×161586369² = 52220309293208322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161586367) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 182764 + ... + 183645.

Almost surely, 2^161586369 is an apocalyptic number.

It is an amenable number.

161586369 is a deficient number, since it is larger than the sum of its proper divisors (109923441).

161586369 is a wasteful number, since it uses less digits than its factorization.

161586369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366429 (or 366419 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 161586369 is about 12711.6627157898. The cubic root of 161586369 is about 544.6718210516.

The spelling of 161586369 in words is "one hundred sixty-one million, five hundred eighty-six thousand, three hundred sixty-nine".