645648383 has 2 divisors, whose sum is σ = 645648384. Its totient is φ = 645648382.

The previous prime is 645648349. The next prime is 645648403. The reversal of 645648383 is 383846546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645648383 - 2⁸ = 645648127 is a prime.

It is a Sophie Germain prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645641383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322824191 + 322824192.

It is an arithmetic number, because the mean of its divisors is an integer number (322824192).

Almost surely, 2^645648383 is an apocalyptic number.

645648383 is a deficient number, since it is larger than the sum of its proper divisors (1).

645648383 is an equidigital number, since it uses as much as digits as its factorization.

645648383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 47.

The square root of 645648383 is about 25409.6120198637. The cubic root of 645648383 is about 864.3016774711.

The spelling of 645648383 in words is "six hundred forty-five million, six hundred forty-eight thousand, three hundred eighty-three".