645650616407 has 2 divisors, whose sum is σ = 645650616408. Its totient is φ = 645650616406.

The previous prime is 645650616293. The next prime is 645650616437. The reversal of 645650616407 is 704616056546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645650616407 - 2¹⁸ = 645650354263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645650616437) 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, 322825308203 + 322825308204.

It is an arithmetic number, because the mean of its divisors is an integer number (322825308204).

Almost surely, 2^645650616407 is an apocalyptic number.

645650616407 is a deficient number, since it is larger than the sum of its proper divisors (1).

645650616407 is an equidigital number, since it uses as much as digits as its factorization.

645650616407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 50.

The spelling of 645650616407 in words is "six hundred forty-five billion, six hundred fifty million, six hundred sixteen thousand, four hundred seven".