648668549 has 8 divisors (see below), whose sum is σ = 673432920. Its totient is φ = 624064000.

The previous prime is 648668543. The next prime is 648668551. The reversal of 648668549 is 945866846.

648668549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7059649 + 641608900 = 2657^2 + 25330^2 .

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 648668549 - 2²⁴ = 631891333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648668494 and 648668503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648668543) 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, 31652 + ... + 47949.

It is an arithmetic number, because the mean of its divisors is an integer number (84179115).

Almost surely, 2^648668549 is an apocalyptic number.

It is an amenable number.

648668549 is a deficient number, since it is larger than the sum of its proper divisors (24764371).

648668549 is a wasteful number, since it uses less digits than its factorization.

648668549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79911.

The product of its digits is 9953280, while the sum is 56.

The square root of 648668549 is about 25468.9722800116. The cubic root of 648668549 is about 865.6472369687.

The spelling of 648668549 in words is "six hundred forty-eight million, six hundred sixty-eight thousand, five hundred forty-nine".