645453353 has 2 divisors, whose sum is σ = 645453354. Its totient is φ = 645453352.

The previous prime is 645453343. The next prime is 645453373. The reversal of 645453353 is 353354546.

645453353 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 can be written as a sum of positive squares in only one way, i.e., 595213609 + 50239744 = 24397^2 + 7088^2 .

It is a cyclic number.

It is not a de Polignac number, because 645453353 - 2⁴ = 645453337 is a prime.

It is a super-3 number, since 3×645453353³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_33569147 and since 645453353 and 33569147 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 (645453343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322726676 + 322726677.

It is an arithmetic number, because the mean of its divisors is an integer number (322726677).

Almost surely, 2^645453353 is an apocalyptic number.

It is an amenable number.

645453353 is a deficient number, since it is larger than the sum of its proper divisors (1).

645453353 is an equidigital number, since it uses as much as digits as its factorization.

645453353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324000, while the sum is 38.

The square root of 645453353 is about 25405.7740090712. The cubic root of 645453353 is about 864.2146426205.

The spelling of 645453353 in words is "six hundred forty-five million, four hundred fifty-three thousand, three hundred fifty-three".