643248656419 has 2 divisors, whose sum is σ = 643248656420. Its totient is φ = 643248656418.

The previous prime is 643248656399. The next prime is 643248656423. The reversal of 643248656419 is 914656842346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643248656419 - 2⁵ = 643248656387 is a prime.

It is a super-3 number, since 3×643248656419³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (643248657419) 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 as a sum of consecutive naturals, namely, 321624328209 + 321624328210.

It is an arithmetic number, because the mean of its divisors is an integer number (321624328210).

Almost surely, 2^643248656419 is an apocalyptic number.

643248656419 is a deficient number, since it is larger than the sum of its proper divisors (1).

643248656419 is an equidigital number, since it uses as much as digits as its factorization.

643248656419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29859840, while the sum is 58.

The spelling of 643248656419 in words is "six hundred forty-three billion, two hundred forty-eight million, six hundred fifty-six thousand, four hundred nineteen".