645053567 has 2 divisors, whose sum is σ = 645053568. Its totient is φ = 645053566.

The previous prime is 645053551. The next prime is 645053573. The reversal of 645053567 is 765350546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645053567 - 2⁴ = 645053551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645053537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322526783 + 322526784.

It is an arithmetic number, because the mean of its divisors is an integer number (322526784).

Almost surely, 2^645053567 is an apocalyptic number.

645053567 is a deficient number, since it is larger than the sum of its proper divisors (1).

645053567 is an equidigital number, since it uses as much as digits as its factorization.

645053567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378000, while the sum is 41.

The square root of 645053567 is about 25397.9047757881. The cubic root of 645053567 is about 864.0361777368.

The spelling of 645053567 in words is "six hundred forty-five million, fifty-three thousand, five hundred sixty-seven".