161516866 has 16 divisors (see below), whose sum is σ = 281580480. Its totient is φ = 68047920.

The previous prime is 161516857. The next prime is 161516867. The reversal of 161516866 is 668615161.

It is a happy number.

161516866 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161516867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96945 + ... + 98596.

It is an arithmetic number, because the mean of its divisors is an integer number (17598780).

Almost surely, 2^161516866 is an apocalyptic number.

161516866 is a deficient number, since it is larger than the sum of its proper divisors (120063614).

161516866 is a wasteful number, since it uses less digits than its factorization.

161516866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195609.

The product of its digits is 51840, while the sum is 40.

The square root of 161516866 is about 12708.9285937092. The cubic root of 161516866 is about 544.5937167849.

It can be divided in two parts, 1615 and 16866, that added together give a palindrome (18481).

The spelling of 161516866 in words is "one hundred sixty-one million, five hundred sixteen thousand, eight hundred sixty-six".