644434362433417 has 2 divisors, whose sum is σ = 644434362433418. Its totient is φ = 644434362433416.

The previous prime is 644434362433321. The next prime is 644434362433423. The reversal of 644434362433417 is 714334263434446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 511033225329936 + 133401137103481 = 22606044^2 + 11549941^2 .

It is a cyclic number.

It is not a de Polignac number, because 644434362433417 - 2⁴⁷ = 503696874078089 is a prime.

It is not a weakly prime, because it can be changed into another prime (644434362463417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322217181216708 + 322217181216709.

It is an arithmetic number, because the mean of its divisors is an integer number (322217181216709).

Almost surely, 2^{644434362433417} is an apocalyptic number.

It is an amenable number.

644434362433417 is a deficient number, since it is larger than the sum of its proper divisors (1).

644434362433417 is an equidigital number, since it uses as much as digits as its factorization.

644434362433417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 167215104, while the sum is 58.

The spelling of 644434362433417 in words is "six hundred forty-four trillion, four hundred thirty-four billion, three hundred sixty-two million, four hundred thirty-three thousand, four hundred seventeen".