645653460289 has 2 divisors, whose sum is σ = 645653460290. Its totient is φ = 645653460288.

The previous prime is 645653460251. The next prime is 645653460373. The reversal of 645653460289 is 982064356546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 559354410000 + 86299050289 = 747900^2 + 293767^2 .

It is a cyclic number.

It is not a de Polignac number, because 645653460289 - 2¹⁹ = 645652936001 is a prime.

It is not a weakly prime, because it can be changed into another prime (645653460589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322826730144 + 322826730145.

It is an arithmetic number, because the mean of its divisors is an integer number (322826730145).

Almost surely, 2^645653460289 is an apocalyptic number.

It is an amenable number.

645653460289 is a deficient number, since it is larger than the sum of its proper divisors (1).

645653460289 is an equidigital number, since it uses as much as digits as its factorization.

645653460289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37324800, while the sum is 58.

The spelling of 645653460289 in words is "six hundred forty-five billion, six hundred fifty-three million, four hundred sixty thousand, two hundred eighty-nine".