648345921073 has 2 divisors, whose sum is σ = 648345921074. Its totient is φ = 648345921072.

The previous prime is 648345921043. The next prime is 648345921133. The reversal of 648345921073 is 370129543846.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 458500974129 + 189844946944 = 677127^2 + 435712^2 .

It is a cyclic number.

It is not a de Polignac number, because 648345921073 - 2³³ = 639755986481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 648345921073.

It is not a weakly prime, because it can be changed into another prime (648345921023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324172960536 + 324172960537.

It is an arithmetic number, because the mean of its divisors is an integer number (324172960537).

It is a 1-persistent number, because it is pandigital, but 2⋅648345921073 = 1296691842146 is not.

Almost surely, 2^648345921073 is an apocalyptic number.

It is an amenable number.

648345921073 is a deficient number, since it is larger than the sum of its proper divisors (1).

648345921073 is an equidigital number, since it uses as much as digits as its factorization.

648345921073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 648345921073 in words is "six hundred forty-eight billion, three hundred forty-five million, nine hundred twenty-one thousand, seventy-three".