645416266661063 has 2 divisors, whose sum is σ = 645416266661064. Its totient is φ = 645416266661062.

The previous prime is 645416266661021. The next prime is 645416266661197. The reversal of 645416266661063 is 360166662614546.

645416266661063 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 645416266661063 - 2⁶ = 645416266660999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645416266660987 and 645416266661005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645416266661363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322708133330531 + 322708133330532.

It is an arithmetic number, because the mean of its divisors is an integer number (322708133330532).

Almost surely, 2^{645416266661063} is an apocalyptic number.

645416266661063 is a deficient number, since it is larger than the sum of its proper divisors (1).

645416266661063 is an equidigital number, since it uses as much as digits as its factorization.

645416266661063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134369280, while the sum is 62.

The spelling of 645416266661063 in words is "six hundred forty-five trillion, four hundred sixteen billion, two hundred sixty-six million, six hundred sixty-one thousand, sixty-three".