645522606403 has 2 divisors, whose sum is σ = 645522606404. Its totient is φ = 645522606402.

The previous prime is 645522606401. The next prime is 645522606451. The reversal of 645522606403 is 304606225546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645522606403 - 2¹ = 645522606401 is a prime.

Together with 645522606401, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 645522606403.

It is not a weakly prime, because it can be changed into another prime (645522606401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322761303201 + 322761303202.

It is an arithmetic number, because the mean of its divisors is an integer number (322761303202).

Almost surely, 2^645522606403 is an apocalyptic number.

645522606403 is a deficient number, since it is larger than the sum of its proper divisors (1).

645522606403 is an equidigital number, since it uses as much as digits as its factorization.

645522606403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1036800, while the sum is 43.

The spelling of 645522606403 in words is "six hundred forty-five billion, five hundred twenty-two million, six hundred six thousand, four hundred three".