644225522446 has 32 divisors (see below), whose sum is σ = 1098176808960. Its totient is φ = 280783778400.

The previous prime is 644225522441. The next prime is 644225522467.

644225522446 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 644225522396 and 644225522405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644225522441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4258746 + ... + 4407421.

It is an arithmetic number, because the mean of its divisors is an integer number (34318025280).

Almost surely, 2^644225522446 is an apocalyptic number.

644225522446 is a deficient number, since it is larger than the sum of its proper divisors (453951286514).

644225522446 is a wasteful number, since it uses less digits than its factorization.

644225522446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8666320.

The product of its digits is 3686400, while the sum is 46.

The spelling of 644225522446 in words is "six hundred forty-four billion, two hundred twenty-five million, five hundred twenty-two thousand, four hundred forty-six".