1644443222146 has 8 divisors (see below), whose sum is σ = 2466694274940. Its totient is φ = 822211797168.

The previous prime is 1644443222117. The next prime is 1644443222183. The reversal of 1644443222146 is 6412223444461.

It can be written as a sum of positive squares in 2 ways, for example, as 1375720213921 + 268723008225 = 1172911^2 + 518385^2 .

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

It is an unprimeable number.

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, 4695681 + ... + 5033716.

Almost surely, 2^{1644443222146} is an apocalyptic number.

1644443222146 is a deficient number, since it is larger than the sum of its proper divisors (822251052794).

1644443222146 is an equidigital number, since it uses as much as digits as its factorization.

1644443222146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9813908.

The product of its digits is 884736, while the sum is 43.

The spelling of 1644443222146 in words is "one trillion, six hundred forty-four billion, four hundred forty-three million, two hundred twenty-two thousand, one hundred forty-six".