644413404314446 has 8 divisors (see below), whose sum is σ = 1040975499277224. Its totient is φ = 297421571222040.

The previous prime is 644413404314413. The next prime is 644413404314507.

644413404314446 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 644413404314393 and 644413404314402.

It is a congruent number.

It is an unprimeable number.

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, 12392565467560 + ... + 12392565467611.

It is an arithmetic number, because the mean of its divisors is an integer number (130121937409653).

Almost surely, 2^{644413404314446} is an apocalyptic number.

644413404314446 is a deficient number, since it is larger than the sum of its proper divisors (396562094962778).

644413404314446 is a wasteful number, since it uses less digits than its factorization.

644413404314446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24785130935186.

The product of its (nonzero) digits is 21233664, while the sum is 52.

It can be divided in two parts, 64441340 and 4314446, that added together give a palindrome (68755786).

The spelling of 644413404314446 in words is "six hundred forty-four trillion, four hundred thirteen billion, four hundred four million, three hundred fourteen thousand, four hundred forty-six".