1644144801 has 8 divisors (see below), whose sum is σ = 2360823360. Its totient is φ = 1011781392.

The previous prime is 1644144797. The next prime is 1644144829. The reversal of 1644144801 is 1084414461.

It is a happy number.

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

It is not a de Polignac number, because 1644144801 - 2² = 1644144797 is a prime.

It is a super-3 number, since 3×1644144801³ (a number of 29 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1644144871) 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 7 ways as a sum of consecutive naturals, for example, 21078741 + ... + 21078818.

It is an arithmetic number, because the mean of its divisors is an integer number (295102920).

Almost surely, 2^1644144801 is an apocalyptic number.

It is an amenable number.

1644144801 is a deficient number, since it is larger than the sum of its proper divisors (716678559).

1644144801 is a wasteful number, since it uses less digits than its factorization.

1644144801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42157575.

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 1644144801 is about 40548.0554527588. The cubic root of 1644144801 is about 1180.2663386639.

The spelling of 1644144801 in words is "one billion, six hundred forty-four million, one hundred forty-four thousand, eight hundred one".