643310012069 has 2 divisors, whose sum is σ = 643310012070. Its totient is φ = 643310012068.

The previous prime is 643310011973. The next prime is 643310012099. The reversal of 643310012069 is 960210013346.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 584365455844 + 58944556225 = 764438^2 + 242785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643310012069 is a prime.

It is a super-2 number, since 2×643310012069² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643310012099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321655006034 + 321655006035.

It is an arithmetic number, because the mean of its divisors is an integer number (321655006035).

Almost surely, 2^643310012069 is an apocalyptic number.

It is an amenable number.

643310012069 is a deficient number, since it is larger than the sum of its proper divisors (1).

643310012069 is an equidigital number, since it uses as much as digits as its factorization.

643310012069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The spelling of 643310012069 in words is "six hundred forty-three billion, three hundred ten million, twelve thousand, sixty-nine".