645732583 has 2 divisors, whose sum is σ = 645732584. Its totient is φ = 645732582.

The previous prime is 645732553. The next prime is 645732653. The reversal of 645732583 is 385237546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645732583 - 2⁵ = 645732551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645732553) 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, 322866291 + 322866292.

It is an arithmetic number, because the mean of its divisors is an integer number (322866292).

Almost surely, 2^645732583 is an apocalyptic number.

645732583 is a deficient number, since it is larger than the sum of its proper divisors (1).

645732583 is an equidigital number, since it uses as much as digits as its factorization.

645732583 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 43.

The square root of 645732583 is about 25411.2688191676. The cubic root of 645732583 is about 864.3392474756.

The spelling of 645732583 in words is "six hundred forty-five million, seven hundred thirty-two thousand, five hundred eighty-three".