643248656527 has 2 divisors, whose sum is σ = 643248656528. Its totient is φ = 643248656526.

The previous prime is 643248656423. The next prime is 643248656549. The reversal of 643248656527 is 725656842346.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643248656527 - 2⁷ = 643248656399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643248653527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321624328263 + 321624328264.

It is an arithmetic number, because the mean of its divisors is an integer number (321624328264).

Almost surely, 2^643248656527 is an apocalyptic number.

643248656527 is a deficient number, since it is larger than the sum of its proper divisors (1).

643248656527 is an equidigital number, since it uses as much as digits as its factorization.

643248656527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58060800, while the sum is 58.

The spelling of 643248656527 in words is "six hundred forty-three billion, two hundred forty-eight million, six hundred fifty-six thousand, five hundred twenty-seven".