161166666 has 32 divisors (see below), whose sum is σ = 336872448. Its totient is φ = 51352560.

The previous prime is 161166641. The next prime is 161166667. The reversal of 161166666 is 666661161.

It is a happy number.

161166666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (161166667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5481 + ... + 18771.

It is an arithmetic number, because the mean of its divisors is an integer number (10527264).

Almost surely, 2^161166666 is an apocalyptic number.

161166666 is an abundant number, since it is smaller than the sum of its proper divisors (175705782).

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

161166666 is a wasteful number, since it uses less digits than its factorization.

161166666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13386.

The product of its digits is 46656, while the sum is 39.

The square root of 161166666 is about 12695.1434021046. The cubic root of 161166666 is about 544.1998369224.

The spelling of 161166666 in words is "one hundred sixty-one million, one hundred sixty-six thousand, six hundred sixty-six".