643514464247 has 2 divisors, whose sum is σ = 643514464248. Its totient is φ = 643514464246.

The previous prime is 643514464237. The next prime is 643514464253. The reversal of 643514464247 is 742464415346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643514464247 - 2⁶ = 643514464183 is a prime.

It is a super-2 number, since 2×643514464247² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643514464195 and 643514464204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643514464237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321757232123 + 321757232124.

It is an arithmetic number, because the mean of its divisors is an integer number (321757232124).

Almost surely, 2^643514464247 is an apocalyptic number.

643514464247 is a deficient number, since it is larger than the sum of its proper divisors (1).

643514464247 is an equidigital number, since it uses as much as digits as its factorization.

643514464247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7741440, while the sum is 50.

The spelling of 643514464247 in words is "six hundred forty-three billion, five hundred fourteen million, four hundred sixty-four thousand, two hundred forty-seven".