166566650 has 12 divisors (see below), whose sum is σ = 309814062. Its totient is φ = 66626640.

The previous prime is 166566643. The next prime is 166566677. The reversal of 166566650 is 56665661.

It can be written as a sum of positive squares in 3 ways, for example, as 71250481 + 95316169 = 8441^2 + 9763^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 166566598 and 166566607.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1665617 + ... + 1665716.

Almost surely, 2^166566650 is an apocalyptic number.

166566650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166566650 is a deficient number, since it is larger than the sum of its proper divisors (143247412).

166566650 is a wasteful number, since it uses less digits than its factorization.

166566650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331345 (or 3331340 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 166566650 is about 12906.0702771990. The cubic root of 166566650 is about 550.2111035359.

The spelling of 166566650 in words is "one hundred sixty-six million, five hundred sixty-six thousand, six hundred fifty".