161610605 has 32 divisors (see below), whose sum is σ = 213857280. Its totient is φ = 116524800.

The previous prime is 161610601. The next prime is 161610611. The reversal of 161610605 is 506016161.

It is not a de Polignac number, because 161610605 - 2² = 161610601 is a prime.

It is a super-2 number, since 2×161610605² = 52235975296932050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161610601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 676076 + ... + 676314.

It is an arithmetic number, because the mean of its divisors is an integer number (6683040).

Almost surely, 2^161610605 is an apocalyptic number.

It is an amenable number.

161610605 is a deficient number, since it is larger than the sum of its proper divisors (52246675).

161610605 is a wasteful number, since it uses less digits than its factorization.

161610605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 161610605 is about 12712.6159778387. The cubic root of 161610605 is about 544.6990510843.

Adding to 161610605 its reverse (506016161), we get a palindrome (667626766).

It can be divided in two parts, 1616 and 10605, that added together give a palindrome (12221).

The spelling of 161610605 in words is "one hundred sixty-one million, six hundred ten thousand, six hundred five".