648388663 has 8 divisors (see below), whose sum is σ = 699785856. Its totient is φ = 597208800.

The previous prime is 648388651. The next prime is 648388667. The reversal of 648388663 is 366883846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 648388663 - 2⁹ = 648388151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 648388663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648388667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48103 + ... + 60088.

It is an arithmetic number, because the mean of its divisors is an integer number (87473232).

Almost surely, 2^648388663 is an apocalyptic number.

648388663 is a deficient number, since it is larger than the sum of its proper divisors (51397193).

648388663 is a wasteful number, since it uses less digits than its factorization.

648388663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108665.

The product of its digits is 3981312, while the sum is 52.

The square root of 648388663 is about 25463.4770406557. The cubic root of 648388663 is about 865.5227165708.

The spelling of 648388663 in words is "six hundred forty-eight million, three hundred eighty-eight thousand, six hundred sixty-three".