645889929988507 has 2 divisors, whose sum is σ = 645889929988508. Its totient is φ = 645889929988506.

The previous prime is 645889929988423. The next prime is 645889929988561. The reversal of 645889929988507 is 705889929988546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645889929988507 - 2²³ = 645889921599899 is a prime.

It is not a weakly prime, because it can be changed into another prime (645889929988907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322944964994253 + 322944964994254.

It is an arithmetic number, because the mean of its divisors is an integer number (322944964994254).

Almost surely, 2^{645889929988507} is an apocalyptic number.

645889929988507 is a deficient number, since it is larger than the sum of its proper divisors (1).

645889929988507 is an equidigital number, since it uses as much as digits as its factorization.

645889929988507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225740390400, while the sum is 97.

The spelling of 645889929988507 in words is "six hundred forty-five trillion, eight hundred eighty-nine billion, nine hundred twenty-nine million, nine hundred eighty-eight thousand, five hundred seven".