645306583 has 2 divisors, whose sum is σ = 645306584. Its totient is φ = 645306582.

The previous prime is 645306577. The next prime is 645306593. The reversal of 645306583 is 385603546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645306583 - 2⁹ = 645306071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645306533) 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, 322653291 + 322653292.

It is an arithmetic number, because the mean of its divisors is an integer number (322653292).

Almost surely, 2^645306583 is an apocalyptic number.

645306583 is a deficient number, since it is larger than the sum of its proper divisors (1).

645306583 is an equidigital number, since it uses as much as digits as its factorization.

645306583 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 645306583 is about 25402.8853282457. The cubic root of 645306583 is about 864.1491329040.

The spelling of 645306583 in words is "six hundred forty-five million, three hundred six thousand, five hundred eighty-three".