1644365413641 has 16 divisors (see below), whose sum is σ = 2324005371648. Its totient is φ = 1030626105600.

The previous prime is 1644365413627. The next prime is 1644365413651. The reversal of 1644365413641 is 1463145634461.

It is not a de Polignac number, because 1644365413641 - 2⁹ = 1644365413129 is a prime.

It is a super-3 number, since 3×1644365413641³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1644365413651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17649730 + ... + 17742651.

It is an arithmetic number, because the mean of its divisors is an integer number (145250335728).

Almost surely, 2^{1644365413641} is an apocalyptic number.

It is an amenable number.

1644365413641 is a deficient number, since it is larger than the sum of its proper divisors (679639958007).

1644365413641 is a wasteful number, since it uses less digits than its factorization.

1644365413641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35393312.

The product of its digits is 2488320, while the sum is 48.

The spelling of 1644365413641 in words is "one trillion, six hundred forty-four billion, three hundred sixty-five million, four hundred thirteen thousand, six hundred forty-one".