1644001363 has 4 divisors (see below), whose sum is σ = 1644090120. Its totient is φ = 1643912608.

The previous prime is 1644001361. The next prime is 1644001397. The reversal of 1644001363 is 3631004461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1644001363 - 2¹ = 1644001361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1644001361) 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, 4870 + ... + 57547.

It is an arithmetic number, because the mean of its divisors is an integer number (411022530).

Almost surely, 2^1644001363 is an apocalyptic number.

1644001363 is a deficient number, since it is larger than the sum of its proper divisors (88757).

1644001363 is an equidigital number, since it uses as much as digits as its factorization.

1644001363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88756.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 1644001363 is about 40546.2866733811. The cubic root of 1644001363 is about 1180.2320148487.

The spelling of 1644001363 in words is "one billion, six hundred forty-four million, one thousand, three hundred sixty-three".