644502343205446 has 32 divisors (see below), whose sum is σ = 1078333081330176. Its totient is φ = 288829475103400.

The previous prime is 644502343205437. The next prime is 644502343205473.

644502343205446 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 644502343205393 and 644502343205402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1704825610 + ... + 1705203613.

It is an arithmetic number, because the mean of its divisors is an integer number (33697908791568).

Almost surely, 2^{644502343205446} is an apocalyptic number.

644502343205446 is a deficient number, since it is larger than the sum of its proper divisors (433830738124730).

644502343205446 is a wasteful number, since it uses less digits than its factorization.

644502343205446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3410029329 (or 3410029307 counting only the distinct ones).

The product of its (nonzero) digits is 33177600, while the sum is 52.

The spelling of 644502343205446 in words is "six hundred forty-four trillion, five hundred two billion, three hundred forty-three million, two hundred five thousand, four hundred forty-six".