13878702020569 has 3 divisors (see below), whose sum is σ = 13878705745983. Its totient is φ = 13878698295156.

The previous prime is 13878702020567. The next prime is 13878702020633. The reversal of 13878702020569 is 96502020787831.

It is a happy number.

The square root of 13878702020569 is 3725413.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 13415774190025 + 462927830544 = 3662755^2 + 680388^2 .

It is not a de Polignac number, because 13878702020569 - 2¹ = 13878702020567 is a prime.

It is a super-2 number, since 2×13878702020569² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13878702020567) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1862707 + ... + 5588119.

It is an arithmetic number, because the mean of its divisors is an integer number (4626235248661).

Almost surely, 2^{13878702020569} is an apocalyptic number.

13878702020569 is the 3725413-rd square number.

13878702020569 is the 1862707-th centered octagonal number.

It is an amenable number.

13878702020569 is a deficient number, since it is larger than the sum of its proper divisors (3725414).

13878702020569 is an frugal number, since it uses more digits than its factorization.

13878702020569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7450826 (or 3725413 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 13878702020569 in words is "thirteen trillion, eight hundred seventy-eight billion, seven hundred two million, twenty thousand, five hundred sixty-nine".