646225522603 has 4 divisors (see below), whose sum is σ = 648330492040. Its totient is φ = 644120553168.

The previous prime is 646225522589. The next prime is 646225522637. The reversal of 646225522603 is 306225522646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646225522603 - 2¹⁷ = 646225391531 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646225522603.

It is not an unprimeable number, because it can be changed into a prime (646225522643) 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 in 3 ways as a sum of consecutive naturals, for example, 1052484258 + ... + 1052484871.

It is an arithmetic number, because the mean of its divisors is an integer number (162082623010).

Almost surely, 2^646225522603 is an apocalyptic number.

646225522603 is a deficient number, since it is larger than the sum of its proper divisors (2104969437).

646225522603 is a wasteful number, since it uses less digits than its factorization.

646225522603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104969436.

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

Adding to 646225522603 its sum of digits (43), we get a palindrome (646225522646).

The spelling of 646225522603 in words is "six hundred forty-six billion, two hundred twenty-five million, five hundred twenty-two thousand, six hundred three".