648005779331 has 2 divisors, whose sum is σ = 648005779332. Its totient is φ = 648005779330.

The previous prime is 648005779321. The next prime is 648005779439. The reversal of 648005779331 is 133977500846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648005779331 - 2¹⁴ = 648005762947 is a prime.

It is a super-2 number, since 2×648005779331² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (648005779321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324002889665 + 324002889666.

It is an arithmetic number, because the mean of its divisors is an integer number (324002889666).

Almost surely, 2^648005779331 is an apocalyptic number.

648005779331 is a deficient number, since it is larger than the sum of its proper divisors (1).

648005779331 is an equidigital number, since it uses as much as digits as its factorization.

648005779331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3810240, while the sum is 53.

The spelling of 648005779331 in words is "six hundred forty-eight billion, five million, seven hundred seventy-nine thousand, three hundred thirty-one".