1644131110009 has 2 divisors, whose sum is σ = 1644131110010. Its totient is φ = 1644131110008.

The previous prime is 1644131110001. The next prime is 1644131110093. The reversal of 1644131110009 is 9000111314461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1074705422400 + 569425687609 = 1036680^2 + 754603^2 .

It is an emirp because it is prime and its reverse (9000111314461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1644131110009 - 2³ = 1644131110001 is a prime.

It is a super-3 number, since 3×1644131110009³ (a number of 38 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1644131110001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822065555004 + 822065555005.

It is an arithmetic number, because the mean of its divisors is an integer number (822065555005).

Almost surely, 2^{1644131110009} is an apocalyptic number.

It is an amenable number.

1644131110009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644131110009 is an equidigital number, since it uses as much as digits as its factorization.

1644131110009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 1644131110009 in words is "one trillion, six hundred forty-four billion, one hundred thirty-one million, one hundred ten thousand, nine".