166632291 has 18 divisors (see below), whose sum is σ = 279988332. Its totient is φ = 95218200.

The previous prime is 166632287. The next prime is 166632293. The reversal of 166632291 is 192236661.

It is a happy number.

It is not a de Polignac number, because 166632291 - 2² = 166632287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166632293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 188485 + ... + 189366.

Almost surely, 2^166632291 is an apocalyptic number.

166632291 is a deficient number, since it is larger than the sum of its proper divisors (113356041).

166632291 is a wasteful number, since it uses less digits than its factorization.

166632291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377871 (or 377861 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 166632291 is about 12908.6130548560. The cubic root of 166632291 is about 550.2833702308.

The spelling of 166632291 in words is "one hundred sixty-six million, six hundred thirty-two thousand, two hundred ninety-one".