161511066 has 12 divisors (see below), whose sum is σ = 349940682. Its totient is φ = 53837016.

The previous prime is 161511029. The next prime is 161511073. The reversal of 161511066 is 660115161.

161511066 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 105575625 + 55935441 = 10275^2 + 7479^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4486401 + ... + 4486436.

Almost surely, 2^161511066 is an apocalyptic number.

161511066 is an abundant number, since it is smaller than the sum of its proper divisors (188429616).

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

161511066 is a wasteful number, since it uses less digits than its factorization.

161511066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8972845 (or 8972842 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 161511066 is about 12708.7004056276. The cubic root of 161511066 is about 544.5871979995.

The spelling of 161511066 in words is "one hundred sixty-one million, five hundred eleven thousand, sixty-six".