643203263556103 has 2 divisors, whose sum is σ = 643203263556104. Its totient is φ = 643203263556102.

The previous prime is 643203263556079. The next prime is 643203263556167. The reversal of 643203263556103 is 301655362302346.

It is a happy number.

643203263556103 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643203263556103 - 2²⁵ = 643203230001671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643203263556803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321601631778051 + 321601631778052.

It is an arithmetic number, because the mean of its divisors is an integer number (321601631778052).

Almost surely, 2^{643203263556103} is an apocalyptic number.

643203263556103 is a deficient number, since it is larger than the sum of its proper divisors (1).

643203263556103 is an equidigital number, since it uses as much as digits as its factorization.

643203263556103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6998400, while the sum is 49.

The spelling of 643203263556103 in words is "six hundred forty-three trillion, two hundred three billion, two hundred sixty-three million, five hundred fifty-six thousand, one hundred three".