645252387239 has 2 divisors, whose sum is σ = 645252387240. Its totient is φ = 645252387238.

The previous prime is 645252387217. The next prime is 645252387257. The reversal of 645252387239 is 932783252546.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645252387239 - 2²⁸ = 644983951783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645252317239) 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, 322626193619 + 322626193620.

It is an arithmetic number, because the mean of its divisors is an integer number (322626193620).

Almost surely, 2^645252387239 is an apocalyptic number.

645252387239 is a deficient number, since it is larger than the sum of its proper divisors (1).

645252387239 is an equidigital number, since it uses as much as digits as its factorization.

645252387239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21772800, while the sum is 56.

The spelling of 645252387239 in words is "six hundred forty-five billion, two hundred fifty-two million, three hundred eighty-seven thousand, two hundred thirty-nine".