166491950 has 12 divisors (see below), whose sum is σ = 309675120. Its totient is φ = 66596760.

The previous prime is 166491943. The next prime is 166491953. The reversal of 166491950 is 59194661.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 166491898 and 166491907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166491953) 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 5 ways as a sum of consecutive naturals, for example, 1664870 + ... + 1664969.

It is an arithmetic number, because the mean of its divisors is an integer number (25806260).

Almost surely, 2^166491950 is an apocalyptic number.

166491950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166491950 is a deficient number, since it is larger than the sum of its proper divisors (143183170).

166491950 is a wasteful number, since it uses less digits than its factorization.

166491950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3329851 (or 3329846 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 166491950 is about 12903.1759656295. The cubic root of 166491950 is about 550.1288403395.

The spelling of 166491950 in words is "one hundred sixty-six million, four hundred ninety-one thousand, nine hundred fifty".