161166506 has 4 divisors (see below), whose sum is σ = 241749762. Its totient is φ = 80583252.

The previous prime is 161166491. The next prime is 161166527. The reversal of 161166506 is 605661161.

161166506 is digitally balanced in base 2, 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: 605661161 = 7 ⋅86523023.

It can be written as a sum of positive squares in only one way, i.e., 161163025 + 3481 = 12695^2 + 59^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40291625 + ... + 40291628.

Almost surely, 2^161166506 is an apocalyptic number.

161166506 is a deficient number, since it is larger than the sum of its proper divisors (80583256).

161166506 is an equidigital number, since it uses as much as digits as its factorization.

161166506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80583255.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 161166506 is about 12695.1371004806. The cubic root of 161166506 is about 544.1996568356.

It can be divided in two parts, 16116 and 6506, that added together give a palindrome (22622).

The spelling of 161166506 in words is "one hundred sixty-one million, one hundred sixty-six thousand, five hundred six".