645210803 has 2 divisors, whose sum is σ = 645210804. Its totient is φ = 645210802.

The previous prime is 645210793. The next prime is 645210827. The reversal of 645210803 is 308012546.

645210803 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 645210803 - 2⁶ = 645210739 is a prime.

It is a Sophie Germain prime.

It is equal to p_33557132 and since 645210803 and 33557132 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (645240803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322605401 + 322605402.

It is an arithmetic number, because the mean of its divisors is an integer number (322605402).

Almost surely, 2^645210803 is an apocalyptic number.

645210803 is a deficient number, since it is larger than the sum of its proper divisors (1).

645210803 is an equidigital number, since it uses as much as digits as its factorization.

645210803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 645210803 is about 25401.0000393685. Note that the first 4 decimals coincide. The cubic root of 645210803 is about 864.1063768449.

The spelling of 645210803 in words is "six hundred forty-five million, two hundred ten thousand, eight hundred three".