645374759 has 2 divisors, whose sum is σ = 645374760. Its totient is φ = 645374758.

The previous prime is 645374707. The next prime is 645374777. The reversal of 645374759 is 957473546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645374759 - 2²⁰ = 644326183 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645374789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322687379 + 322687380.

It is an arithmetic number, because the mean of its divisors is an integer number (322687380).

Almost surely, 2^645374759 is an apocalyptic number.

645374759 is a deficient number, since it is larger than the sum of its proper divisors (1).

645374759 is an equidigital number, since it uses as much as digits as its factorization.

645374759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3175200, while the sum is 50.

The square root of 645374759 is about 25404.2271876158. The cubic root of 645374759 is about 864.1795639984.

It can be divided in two parts, 64537 and 4759, that added together give a palindrome (69296).

The spelling of 645374759 in words is "six hundred forty-five million, three hundred seventy-four thousand, seven hundred fifty-nine".