645522624021577 has 2 divisors, whose sum is σ = 645522624021578. Its totient is φ = 645522624021576.

The previous prime is 645522624021529. The next prime is 645522624021619. The reversal of 645522624021577 is 775120426225546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 366193040541241 + 279329583480336 = 19136171^2 + 16713156^2 .

It is a cyclic number.

It is not a de Polignac number, because 645522624021577 - 2⁷ = 645522624021449 is a prime.

It is not a weakly prime, because it can be changed into another prime (645522624025577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322761312010788 + 322761312010789.

It is an arithmetic number, because the mean of its divisors is an integer number (322761312010789).

Almost surely, 2^{645522624021577} is an apocalyptic number.

It is an amenable number.

645522624021577 is a deficient number, since it is larger than the sum of its proper divisors (1).

645522624021577 is an equidigital number, since it uses as much as digits as its factorization.

645522624021577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448000, while the sum is 58.

The spelling of 645522624021577 in words is "six hundred forty-five trillion, five hundred twenty-two billion, six hundred twenty-four million, twenty-one thousand, five hundred seventy-seven".