645304135036643 has 2 divisors, whose sum is σ = 645304135036644. Its totient is φ = 645304135036642.

The previous prime is 645304135036597. The next prime is 645304135036679. The reversal of 645304135036643 is 346630531403546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645304135036643 - 2²² = 645304130842339 is a prime.

It is not a weakly prime, because it can be changed into another prime (645304135836643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322652067518321 + 322652067518322.

It is an arithmetic number, because the mean of its divisors is an integer number (322652067518322).

Almost surely, 2^{645304135036643} is an apocalyptic number.

645304135036643 is a deficient number, since it is larger than the sum of its proper divisors (1).

645304135036643 is an equidigital number, since it uses as much as digits as its factorization.

645304135036643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27993600, while the sum is 53.

The spelling of 645304135036643 in words is "six hundred forty-five trillion, three hundred four billion, one hundred thirty-five million, thirty-six thousand, six hundred forty-three".