645321203049647 has 2 divisors, whose sum is σ = 645321203049648. Its totient is φ = 645321203049646.

The previous prime is 645321203049599. The next prime is 645321203049667. The reversal of 645321203049647 is 746940302123546.

It is a happy number.

645321203049647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645321203049647 - 2⁶ = 645321203049583 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645321203049592 and 645321203049601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645321203049667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322660601524823 + 322660601524824.

It is an arithmetic number, because the mean of its divisors is an integer number (322660601524824).

Almost surely, 2^{645321203049647} is an apocalyptic number.

645321203049647 is a deficient number, since it is larger than the sum of its proper divisors (1).

645321203049647 is an equidigital number, since it uses as much as digits as its factorization.

645321203049647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26127360, while the sum is 56.

The spelling of 645321203049647 in words is "six hundred forty-five trillion, three hundred twenty-one billion, two hundred three million, forty-nine thousand, six hundred forty-seven".