645224263 has 2 divisors, whose sum is σ = 645224264. Its totient is φ = 645224262.

The previous prime is 645224227. The next prime is 645224269. The reversal of 645224263 is 362422546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645224263 - 2⁹ = 645223751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645224269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322612131 + 322612132.

It is an arithmetic number, because the mean of its divisors is an integer number (322612132).

Almost surely, 2^645224263 is an apocalyptic number.

645224263 is a deficient number, since it is larger than the sum of its proper divisors (1).

645224263 is an equidigital number, since it uses as much as digits as its factorization.

645224263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 34.

The square root of 645224263 is about 25401.2649881851. The cubic root of 645224263 is about 864.1123856258.

The spelling of 645224263 in words is "six hundred forty-five million, two hundred twenty-four thousand, two hundred sixty-three".