1644049268544 has 112 divisors (see below), whose sum is σ = 4382984595456. Its totient is φ = 543854438400.

The previous prime is 1644049268531. The next prime is 1644049268573. The reversal of 1644049268544 is 4458629404461.

It is a super-3 number, since 3×1644049268544³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24715009 + ... + 24781439.

Almost surely, 2^{1644049268544} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1644049268544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2191492297728).

1644049268544 is an abundant number, since it is smaller than the sum of its proper divisors (2738935326912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1644049268544 is a wasteful number, since it uses less digits than its factorization.

1644049268544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67424 (or 67414 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 57.

The spelling of 1644049268544 in words is "one trillion, six hundred forty-four billion, forty-nine million, two hundred sixty-eight thousand, five hundred forty-four".