3989844545569 has 4 divisors (see below), whose sum is σ = 3989912195860. Its totient is φ = 3989776895280.

The previous prime is 3989844545539. The next prime is 3989844545573. The reversal of 3989844545569 is 9655454489893.

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 315492285969 + 3674352259600 = 561687^2 + 1916860^2 .

It is a cyclic number.

It is not a de Polignac number, because 3989844545569 - 2¹³ = 3989844537377 is a prime.

It is a super-2 number, since 2×3989844545569² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3989844545539) 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, 33736602 + ... + 33854659.

It is an arithmetic number, because the mean of its divisors is an integer number (997478048965).

Almost surely, 2^{3989844545569} is an apocalyptic number.

It is an amenable number.

3989844545569 is a deficient number, since it is larger than the sum of its proper divisors (67650291).

3989844545569 is an equidigital number, since it uses as much as digits as its factorization.

3989844545569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67650290.

The product of its digits is 6718464000, while the sum is 79.

The spelling of 3989844545569 in words is "three trillion, nine hundred eighty-nine billion, eight hundred forty-four million, five hundred forty-five thousand, five hundred sixty-nine".