644202343202446 has 16 divisors (see below), whose sum is σ = 1139970966773760. Its totient is φ = 267180695337240.

The previous prime is 644202343202437. The next prime is 644202343202497.

644202343202446 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 644202343202396 and 644202343202405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 742168597726 + ... + 742168598593.

It is an arithmetic number, because the mean of its divisors is an integer number (71248185423360).

Almost surely, 2^{644202343202446} is an apocalyptic number.

644202343202446 is a deficient number, since it is larger than the sum of its proper divisors (495768623571314).

644202343202446 is a wasteful number, since it uses less digits than its factorization.

644202343202446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484337196359.

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

The spelling of 644202343202446 in words is "six hundred forty-four trillion, two hundred two billion, three hundred forty-three million, two hundred two thousand, four hundred forty-six".