648664550 has 12 divisors (see below), whose sum is σ = 1206516156. Its totient is φ = 259465800.

The previous prime is 648664517. The next prime is 648664609. The reversal of 648664550 is 55466846.

It is a congruent number.

It is an unprimeable number.

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, 6486596 + ... + 6486695.

It is an arithmetic number, because the mean of its divisors is an integer number (100543013).

Almost surely, 2^648664550 is an apocalyptic number.

648664550 is a deficient number, since it is larger than the sum of its proper divisors (557851606).

648664550 is a wasteful number, since it uses less digits than its factorization.

648664550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12973303 (or 12973298 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 44.

The square root of 648664550 is about 25468.8937726003. The cubic root of 648664550 is about 865.6454580784.

The spelling of 648664550 in words is "six hundred forty-eight million, six hundred sixty-four thousand, five hundred fifty".