645226409753 has 2 divisors, whose sum is σ = 645226409754. Its totient is φ = 645226409752.

The previous prime is 645226409683. The next prime is 645226409777. The reversal of 645226409753 is 357904622546.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 455067620569 + 190158789184 = 674587^2 + 436072^2 .

It is a cyclic number.

It is not a de Polignac number, because 645226409753 - 2¹⁴ = 645226393369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645226409695 and 645226409704.

It is not a weakly prime, because it can be changed into another prime (645226409153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322613204876 + 322613204877.

It is an arithmetic number, because the mean of its divisors is an integer number (322613204877).

Almost surely, 2^645226409753 is an apocalyptic number.

It is an amenable number.

645226409753 is a deficient number, since it is larger than the sum of its proper divisors (1).

645226409753 is an equidigital number, since it uses as much as digits as its factorization.

645226409753 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10886400, while the sum is 53.

The spelling of 645226409753 in words is "six hundred forty-five billion, two hundred twenty-six million, four hundred nine thousand, seven hundred fifty-three".