161115605 has 16 divisors (see below), whose sum is σ = 221168640. Its totient is φ = 110374272.

The previous prime is 161115593. The next prime is 161115673. The reversal of 161115605 is 506511161.

It is a cyclic number.

It is not a de Polignac number, because 161115605 - 2⁴ = 161115589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60257 + ... + 62873.

It is an arithmetic number, because the mean of its divisors is an integer number (13823040).

Almost surely, 2^161115605 is an apocalyptic number.

It is an amenable number.

161115605 is a deficient number, since it is larger than the sum of its proper divisors (60053035).

161115605 is a wasteful number, since it uses less digits than its factorization.

161115605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4388.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 161115605 is about 12693.1321981613. The cubic root of 161115605 is about 544.1423595221.

Adding to 161115605 its reverse (506511161), we get a palindrome (667626766).

The spelling of 161115605 in words is "one hundred sixty-one million, one hundred fifteen thousand, six hundred five".