1644222224461 has 4 divisors (see below), whose sum is σ = 1644692140000. Its totient is φ = 1643752308924.

The previous prime is 1644222224453. The next prime is 1644222224587.

1644222224461 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1644222224461 - 2³ = 1644222224453 is a prime.

It is a super-3 number, since 3×1644222224461³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644222224261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234952521 + ... + 234959518.

It is an arithmetic number, because the mean of its divisors is an integer number (411173035000).

Almost surely, 2^{1644222224461} is an apocalyptic number.

It is an amenable number.

1644222224461 is a deficient number, since it is larger than the sum of its proper divisors (469915539).

1644222224461 is an equidigital number, since it uses as much as digits as its factorization.

1644222224461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469915538.

The product of its digits is 294912, while the sum is 40.

The spelling of 1644222224461 in words is "one trillion, six hundred forty-four billion, two hundred twenty-two million, two hundred twenty-four thousand, four hundred sixty-one".