649166 has 16 divisors (see below), whose sum is σ = 1127520. Its totient is φ = 274560.

The previous prime is 649157. The next prime is 649183. The reversal of 649166 is 661946.

649166 = 43² + 44² + ... + 126².

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649166.

It is an unprimeable number.

649166 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 986 + ... + 1506.

It is an arithmetic number, because the mean of its divisors is an integer number (70470).

2⁶⁴⁹¹⁶⁶ is an apocalyptic number.

649166 is a deficient number, since it is larger than the sum of its proper divisors (478354).

649166 is a wasteful number, since it uses less digits than its factorization.

649166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619.

The product of its digits is 7776, while the sum is 32.

The square root of 649166 is about 805.7083839703. The cubic root of 649166 is about 86.5868462973.

The spelling of 649166 in words is "six hundred forty-nine thousand, one hundred sixty-six".