645434434573 has 2 divisors, whose sum is σ = 645434434574. Its totient is φ = 645434434572.

The previous prime is 645434434501. The next prime is 645434434609. The reversal of 645434434573 is 375434434546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 600349131684 + 45085302889 = 774822^2 + 212333^2 .

It is a cyclic number.

It is not a de Polignac number, because 645434434573 - 2¹³ = 645434426381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645434434573.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645434435573) 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, 322717217286 + 322717217287.

It is an arithmetic number, because the mean of its divisors is an integer number (322717217287).

Almost surely, 2^645434434573 is an apocalyptic number.

It is an amenable number.

645434434573 is a deficient number, since it is larger than the sum of its proper divisors (1).

645434434573 is an equidigital number, since it uses as much as digits as its factorization.

645434434573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29030400, while the sum is 52.

The spelling of 645434434573 in words is "six hundred forty-five billion, four hundred thirty-four million, four hundred thirty-four thousand, five hundred seventy-three".