645622704563 has 2 divisors, whose sum is σ = 645622704564. Its totient is φ = 645622704562.

The previous prime is 645622704527. The next prime is 645622704577. The reversal of 645622704563 is 365407226546.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645622704563 is a prime.

It is not a weakly prime, because it can be changed into another prime (645622704263) 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, 322811352281 + 322811352282.

It is an arithmetic number, because the mean of its divisors is an integer number (322811352282).

Almost surely, 2^645622704563 is an apocalyptic number.

645622704563 is a deficient number, since it is larger than the sum of its proper divisors (1).

645622704563 is an equidigital number, since it uses as much as digits as its factorization.

645622704563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7257600, while the sum is 50.

The spelling of 645622704563 in words is "six hundred forty-five billion, six hundred twenty-two million, seven hundred four thousand, five hundred sixty-three".