644430202034446 has 64 divisors (see below), whose sum is σ = 1017263019801600. Its totient is φ = 305898000912000.

The previous prime is 644430202034407. The next prime is 644430202034513.

644430202034446 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 644430202034396 and 644430202034405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 367594336 + ... + 369343276.

It is an arithmetic number, because the mean of its divisors is an integer number (15894734684400).

Almost surely, 2^{644430202034446} is an apocalyptic number.

644430202034446 is a deficient number, since it is larger than the sum of its proper divisors (372832817767154).

644430202034446 is a wasteful number, since it uses less digits than its factorization.

644430202034446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749865.

The product of its (nonzero) digits is 5308416, while the sum is 46.

It can be divided in two parts, 64443020 and 2034446, that added together give a palindrome (66477466).

The spelling of 644430202034446 in words is "six hundred forty-four trillion, four hundred thirty billion, two hundred two million, thirty-four thousand, four hundred forty-six".