646145447 has 2 divisors, whose sum is σ = 646145448. Its totient is φ = 646145446.

The previous prime is 646145443. The next prime is 646145453. The reversal of 646145447 is 744541646.

646145447 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 646145447 - 2² = 646145443 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646145441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323072723 + 323072724.

It is an arithmetic number, because the mean of its divisors is an integer number (323072724).

Almost surely, 2^646145447 is an apocalyptic number.

646145447 is a deficient number, since it is larger than the sum of its proper divisors (1).

646145447 is an equidigital number, since it uses as much as digits as its factorization.

646145447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 41.

The square root of 646145447 is about 25419.3911610802. The cubic root of 646145447 is about 864.5234199649.

The spelling of 646145447 in words is "six hundred forty-six million, one hundred forty-five thousand, four hundred forty-seven".