166523866 has 8 divisors (see below), whose sum is σ = 262932480. Its totient is φ = 78879708.

The previous prime is 166523849. The next prime is 166523869. The reversal of 166523866 is 668325661.

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 (166523869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2191066 + ... + 2191141.

It is an arithmetic number, because the mean of its divisors is an integer number (32866560).

Almost surely, 2^166523866 is an apocalyptic number.

166523866 is a deficient number, since it is larger than the sum of its proper divisors (96408614).

166523866 is a wasteful number, since it uses less digits than its factorization.

166523866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4382228.

The product of its digits is 311040, while the sum is 43.

The square root of 166523866 is about 12904.4126561421. The cubic root of 166523866 is about 550.1639907682.

The spelling of 166523866 in words is "one hundred sixty-six million, five hundred twenty-three thousand, eight hundred sixty-six".