648889420462864 has 45 divisors (see below), whose sum is σ = 1462485798822261. Its totient is φ = 278095160232960.

The previous prime is 648889420462859. The next prime is 648889420462891. The reversal of 648889420462864 is 468264024988846.

The square root of 648889420462864 is 25473308.

It is a perfect power (a square), and thus also a powerful number.

648889420462864 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 only one way, i.e., 66613216302864 + 582276204160000 = 8161692^2 + 24130400^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 712797744 + ... + 713707504.

Almost surely, 2^{648889420462864} is an apocalyptic number.

648889420462864 is the 25473308-th square number.

It is an amenable number.

648889420462864 is an abundant number, since it is smaller than the sum of its proper divisors (813596378359397).

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

648889420462864 is an frugal number, since it uses more digits than its factorization.

648889420462864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1819544 (or 909770 counting only the distinct ones).

The product of its (nonzero) digits is 8153726976, while the sum is 79.

The spelling of 648889420462864 in words is "six hundred forty-eight trillion, eight hundred eighty-nine billion, four hundred twenty million, four hundred sixty-two thousand, eight hundred sixty-four".