645769343 has 2 divisors, whose sum is σ = 645769344. Its totient is φ = 645769342.

The previous prime is 645769309. The next prime is 645769351. The reversal of 645769343 is 343967546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645769343 - 2⁶ = 645769279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645769043) 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, 322884671 + 322884672.

It is an arithmetic number, because the mean of its divisors is an integer number (322884672).

Almost surely, 2^645769343 is an apocalyptic number.

645769343 is a deficient number, since it is larger than the sum of its proper divisors (1).

645769343 is an equidigital number, since it uses as much as digits as its factorization.

645769343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 47.

The square root of 645769343 is about 25411.9921100255. The cubic root of 645769343 is about 864.3556487479.

The spelling of 645769343 in words is "six hundred forty-five million, seven hundred sixty-nine thousand, three hundred forty-three".