648305050021 has 2 divisors, whose sum is σ = 648305050022. Its totient is φ = 648305050020.

The previous prime is 648305049967. The next prime is 648305050039. The reversal of 648305050021 is 120050503846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 645956193796 + 2348856225 = 803714^2 + 48465^2 .

It is a cyclic number.

It is not a de Polignac number, because 648305050021 - 2⁷ = 648305049893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648305050321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324152525010 + 324152525011.

It is an arithmetic number, because the mean of its divisors is an integer number (324152525011).

Almost surely, 2^648305050021 is an apocalyptic number.

It is an amenable number.

648305050021 is a deficient number, since it is larger than the sum of its proper divisors (1).

648305050021 is an equidigital number, since it uses as much as digits as its factorization.

648305050021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 648305050021 its reverse (120050503846), we get a palindrome (768355553867).

The spelling of 648305050021 in words is "six hundred forty-eight billion, three hundred five million, fifty thousand, twenty-one".