645623543611 has 2 divisors, whose sum is σ = 645623543612. Its totient is φ = 645623543610.

The previous prime is 645623543549. The next prime is 645623543623. The reversal of 645623543611 is 116345326546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645623543611 - 2¹⁹ = 645623019323 is a prime.

It is not a weakly prime, because it can be changed into another prime (645623543651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322811771805 + 322811771806.

It is an arithmetic number, because the mean of its divisors is an integer number (322811771806).

Almost surely, 2^645623543611 is an apocalyptic number.

645623543611 is a deficient number, since it is larger than the sum of its proper divisors (1).

645623543611 is an equidigital number, since it uses as much as digits as its factorization.

645623543611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1555200, while the sum is 46.

The spelling of 645623543611 in words is "six hundred forty-five billion, six hundred twenty-three million, five hundred forty-three thousand, six hundred eleven".