1443643438217 has 4 divisors (see below), whose sum is σ = 1456887873540. Its totient is φ = 1430399002896.

The previous prime is 1443643438213. The next prime is 1443643438219. The reversal of 1443643438217 is 7128343463441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1173764227216 + 269879211001 = 1083404^2 + 519499^2 .

It is a cyclic number.

It is not a de Polignac number, because 1443643438217 - 2² = 1443643438213 is a prime.

It is a super-4 number, since 4×1443643438217⁴ (a number of 50 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1443643438213) 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, 6622217498 + ... + 6622217715.

It is an arithmetic number, because the mean of its divisors is an integer number (364221968385).

Almost surely, 2^{1443643438217} is an apocalyptic number.

It is an amenable number.

1443643438217 is a deficient number, since it is larger than the sum of its proper divisors (13244435323).

1443643438217 is a wasteful number, since it uses less digits than its factorization.

1443643438217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13244435322.

The product of its digits is 4644864, while the sum is 50.

The spelling of 1443643438217 in words is "one trillion, four hundred forty-three billion, six hundred forty-three million, four hundred thirty-eight thousand, two hundred seventeen".