644333222333446 has 8 divisors (see below), whose sum is σ = 966502488565224. Its totient is φ = 322165726145040.

The previous prime is 644333222333441. The next prime is 644333222333447.

644333222333446 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 = 644333222333393 and 644333222333402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644333222333441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441600415 + ... + 443057098.

It is an arithmetic number, because the mean of its divisors is an integer number (120812811070653).

Almost surely, 2^{644333222333446} is an apocalyptic number.

644333222333446 is a deficient number, since it is larger than the sum of its proper divisors (322169266231778).

644333222333446 is a wasteful number, since it uses less digits than its factorization.

644333222333446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885021686.

The product of its digits is 53747712, while the sum is 52.

The spelling of 644333222333446 in words is "six hundred forty-four trillion, three hundred thirty-three billion, two hundred twenty-two million, three hundred thirty-three thousand, four hundred forty-six".