161600506 has 4 divisors (see below), whose sum is σ = 242400762. Its totient is φ = 80800252.

The previous prime is 161600503. The next prime is 161600531. The reversal of 161600506 is 605006161.

161600506 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605006161 = 22963 ⋅26347.

It can be written as a sum of positive squares in only one way, i.e., 97199881 + 64400625 = 9859^2 + 8025^2 .

It is a super-2 number, since 2×161600506² = 52229447078912072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161600501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40400125 + ... + 40400128.

Almost surely, 2^161600506 is an apocalyptic number.

161600506 is a deficient number, since it is larger than the sum of its proper divisors (80800256).

161600506 is an equidigital number, since it uses as much as digits as its factorization.

161600506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80800255.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 161600506 is about 12712.2187677840. The cubic root of 161600506 is about 544.6877048191.

Adding to 161600506 its reverse (605006161), we get a palindrome (766606667).

The spelling of 161600506 in words is "one hundred sixty-one million, six hundred thousand, five hundred six".