649194663 has 16 divisors (see below), whose sum is σ = 939524096. Its totient is φ = 396355680.

The previous prime is 649194661. The next prime is 649194673. The reversal of 649194663 is 366491946.

It is not a de Polignac number, because 649194663 - 2¹ = 649194661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649194661) 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 15 ways as a sum of consecutive naturals, for example, 60583 + ... + 70488.

It is an arithmetic number, because the mean of its divisors is an integer number (58720256).

Almost surely, 2^649194663 is an apocalyptic number.

649194663 is a deficient number, since it is larger than the sum of its proper divisors (290329433).

649194663 is a wasteful number, since it uses less digits than its factorization.

649194663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131214.

The product of its digits is 839808, while the sum is 48.

The square root of 649194663 is about 25479.2987148391. The cubic root of 649194663 is about 865.8812065148.

The spelling of 649194663 in words is "six hundred forty-nine million, one hundred ninety-four thousand, six hundred sixty-three".