166978 has 8 divisors (see below), whose sum is σ = 286272. Its totient is φ = 71556.

The previous prime is 166973. The next prime is 166979. The reversal of 166978 is 879661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (166973) by changing a digit.

166978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5950 + ... + 5977.

It is an arithmetic number, because the mean of its divisors is an integer number (35784).

2¹⁶⁶⁹⁷⁸ is an apocalyptic number.

166978 is a deficient number, since it is larger than the sum of its proper divisors (119294).

166978 is a wasteful number, since it uses less digits than its factorization.

166978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11936.

The product of its digits is 18144, while the sum is 37.

The square root of 166978 is about 408.6294164644. The cubic root of 166978 is about 55.0663661675.

The spelling of 166978 in words is "one hundred sixty-six thousand, nine hundred seventy-eight".