643548473107 has 2 divisors, whose sum is σ = 643548473108. Its totient is φ = 643548473106.

The previous prime is 643548473069. The next prime is 643548473137. The reversal of 643548473107 is 701374845346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643548473107 - 2¹⁹ = 643547948819 is a prime.

It is a super-2 number, since 2×643548473107² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (643548473137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321774236553 + 321774236554.

It is an arithmetic number, because the mean of its divisors is an integer number (321774236554).

Almost surely, 2^643548473107 is an apocalyptic number.

643548473107 is a deficient number, since it is larger than the sum of its proper divisors (1).

643548473107 is an equidigital number, since it uses as much as digits as its factorization.

643548473107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6773760, while the sum is 52.

The spelling of 643548473107 in words is "six hundred forty-three billion, five hundred forty-eight million, four hundred seventy-three thousand, one hundred seven".