645226409683 has 2 divisors, whose sum is σ = 645226409684. Its totient is φ = 645226409682.

The previous prime is 645226409669. The next prime is 645226409753. The reversal of 645226409683 is 386904622546.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645226409683 is a prime.

It is not a weakly prime, because it can be changed into another prime (645226409083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322613204841 + 322613204842.

It is an arithmetic number, because the mean of its divisors is an integer number (322613204842).

Almost surely, 2^645226409683 is an apocalyptic number.

645226409683 is a deficient number, since it is larger than the sum of its proper divisors (1).

645226409683 is an equidigital number, since it uses as much as digits as its factorization.

645226409683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14929920, while the sum is 55.

The spelling of 645226409683 in words is "six hundred forty-five billion, two hundred twenty-six million, four hundred nine thousand, six hundred eighty-three".