161278166 has 16 divisors (see below), whose sum is σ = 276756480. Its totient is φ = 69049320.

The previous prime is 161278163. The next prime is 161278199. The reversal of 161278166 is 661872161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161278163) 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, 9995 + ... + 20553.

It is an arithmetic number, because the mean of its divisors is an integer number (17297280).

Almost surely, 2^161278166 is an apocalyptic number.

161278166 is a deficient number, since it is larger than the sum of its proper divisors (115478314).

161278166 is a wasteful number, since it uses less digits than its factorization.

161278166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11659.

The product of its digits is 24192, while the sum is 38.

The square root of 161278166 is about 12699.5340859419. The cubic root of 161278166 is about 544.3253059905.

The spelling of 161278166 in words is "one hundred sixty-one million, two hundred seventy-eight thousand, one hundred sixty-six".