1944888865919 has 16 divisors (see below), whose sum is σ = 2076494976288. Its totient is φ = 1815253819392.

The previous prime is 1944888865873. The next prime is 1944888865921. The reversal of 1944888865919 is 9195688884491.

It is a cyclic number.

It is not a de Polignac number, because 1944888865919 - 2¹⁶ = 1944888800383 is a prime.

It is a super-2 number, since 2×1944888865919² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1944888865999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105104 + ... + 1975050.

It is an arithmetic number, because the mean of its divisors is an integer number (129780936018).

Almost surely, 2^{1944888865919} is an apocalyptic number.

1944888865919 is a deficient number, since it is larger than the sum of its proper divisors (131606110369).

1944888865919 is a wasteful number, since it uses less digits than its factorization.

1944888865919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1870474.

The product of its digits is 1433272320, while the sum is 80.

The spelling of 1944888865919 in words is "one trillion, nine hundred forty-four billion, eight hundred eighty-eight million, eight hundred sixty-five thousand, nine hundred nineteen".