645116551663 has 2 divisors, whose sum is σ = 645116551664. Its totient is φ = 645116551662.

The previous prime is 645116551609. The next prime is 645116551697. The reversal of 645116551663 is 366155611546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645116551663 - 2⁹ = 645116551151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645116531663) 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, 322558275831 + 322558275832.

It is an arithmetic number, because the mean of its divisors is an integer number (322558275832).

Almost surely, 2^645116551663 is an apocalyptic number.

645116551663 is a deficient number, since it is larger than the sum of its proper divisors (1).

645116551663 is an equidigital number, since it uses as much as digits as its factorization.

645116551663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944000, while the sum is 49.

The spelling of 645116551663 in words is "six hundred forty-five billion, one hundred sixteen million, five hundred fifty-one thousand, six hundred sixty-three".