161606508 has 120 divisors (see below), whose sum is σ = 451745280. Its totient is φ = 44946720.

The previous prime is 161606453. The next prime is 161606519. The reversal of 161606508 is 805606161.

It is a super-2 number, since 2×161606508² = 52233326855908128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2045613 + ... + 2045691.

It is an arithmetic number, because the mean of its divisors is an integer number (3764544).

Almost surely, 2^161606508 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161606508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225872640).

161606508 is an abundant number, since it is smaller than the sum of its proper divisors (290138772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161606508 is an equidigital number, since it uses as much as digits as its factorization.

161606508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 161606508 is about 12712.4548376779. The cubic root of 161606508 is about 544.6944481461.

The spelling of 161606508 in words is "one hundred sixty-one million, six hundred six thousand, five hundred eight".