645757363 has 2 divisors, whose sum is σ = 645757364. Its totient is φ = 645757362.

The previous prime is 645757327. The next prime is 645757429. The reversal of 645757363 is 363757546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645757363 - 2⁹ = 645756851 is a prime.

It is not a weakly prime, because it can be changed into another prime (645757663) 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, 322878681 + 322878682.

It is an arithmetic number, because the mean of its divisors is an integer number (322878682).

Almost surely, 2^645757363 is an apocalyptic number.

645757363 is a deficient number, since it is larger than the sum of its proper divisors (1).

645757363 is an equidigital number, since it uses as much as digits as its factorization.

645757363 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1587600, while the sum is 46.

The square root of 645757363 is about 25411.7563934491. The cubic root of 645757363 is about 864.3503036791.

The spelling of 645757363 in words is "six hundred forty-five million, seven hundred fifty-seven thousand, three hundred sixty-three".