648451566 has 96 divisors (see below), whose sum is σ = 1657943040. Its totient is φ = 179299008.

The previous prime is 648451561. The next prime is 648451579. The reversal of 648451566 is 665154846.

648451566 is a `hidden beast` number, since 6 + 4 + 84 + 5 + 1 + 566 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648451561) 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 47 ways as a sum of consecutive naturals, for example, 1710765 + ... + 1711143.

It is an arithmetic number, because the mean of its divisors is an integer number (17270240).

Almost surely, 2^648451566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648451566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (828971520).

648451566 is an abundant number, since it is smaller than the sum of its proper divisors (1009491474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648451566 is a wasteful number, since it uses less digits than its factorization.

648451566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798 (or 795 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 648451566 is about 25464.7121719449. The cubic root of 648451566 is about 865.5507050382.

The spelling of 648451566 in words is "six hundred forty-eight million, four hundred fifty-one thousand, five hundred sixty-six".