161207605 has 16 divisors (see below), whose sum is σ = 209591424. Its totient is φ = 118324800.

The previous prime is 161207597. The next prime is 161207611. The reversal of 161207605 is 506702161.

It is not a de Polignac number, because 161207605 - 2³ = 161207597 is a prime.

It is a Duffinian number.

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, 3430 + ... + 18280.

It is an arithmetic number, because the mean of its divisors is an integer number (13099464).

Almost surely, 2^161207605 is an apocalyptic number.

It is an amenable number.

161207605 is a deficient number, since it is larger than the sum of its proper divisors (48383819).

161207605 is a wasteful number, since it uses less digits than its factorization.

161207605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15036.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 161207605 is about 12696.7556879701. The cubic root of 161207605 is about 544.2459116092.

Adding to 161207605 its reverse (506702161), we get a palindrome (667909766).

The spelling of 161207605 in words is "one hundred sixty-one million, two hundred seven thousand, six hundred five".