645302384161 has 2 divisors, whose sum is σ = 645302384162. Its totient is φ = 645302384160.

The previous prime is 645302384143. The next prime is 645302384183. The reversal of 645302384161 is 161483203546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 439676412561 + 205625971600 = 663081^2 + 453460^2 .

It is a cyclic number.

It is not a de Polignac number, because 645302384161 - 2⁷ = 645302384033 is a prime.

It is not a weakly prime, because it can be changed into another prime (645302384101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322651192080 + 322651192081.

It is an arithmetic number, because the mean of its divisors is an integer number (322651192081).

Almost surely, 2^645302384161 is an apocalyptic number.

It is an amenable number.

645302384161 is a deficient number, since it is larger than the sum of its proper divisors (1).

645302384161 is an equidigital number, since it uses as much as digits as its factorization.

645302384161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 645302384161 in words is "six hundred forty-five billion, three hundred two million, three hundred eighty-four thousand, one hundred sixty-one".