161156666 has 16 divisors (see below), whose sum is σ = 263919168. Its totient is φ = 73195200.

The previous prime is 161156657. The next prime is 161156717. The reversal of 161156666 is 666651161.

It is a happy number.

161156666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39251 + ... + 43161.

It is an arithmetic number, because the mean of its divisors is an integer number (16494948).

Almost surely, 2^161156666 is an apocalyptic number.

161156666 is a deficient number, since it is larger than the sum of its proper divisors (102762502).

161156666 is a wasteful number, since it uses less digits than its factorization.

161156666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5797.

The product of its digits is 38880, while the sum is 38.

The square root of 161156666 is about 12694.7495445952. The cubic root of 161156666 is about 544.1885812638.

The spelling of 161156666 in words is "one hundred sixty-one million, one hundred fifty-six thousand, six hundred sixty-six".