13866976897921 has 9 divisors (see below), whose sum is σ = 16131003448899. Its totient is φ = 11885957855184.

The previous prime is 13866976897903. The next prime is 13866976897931. The reversal of 13866976897921 is 12979867966831.

The square root of 13866976897921 is 3723839.

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

It can be written as a sum of positive squares in only one way, i.e., 11925591689025 + 1941385208896 = 3453345^2 + 1393336^2 .

It is not a de Polignac number, because 13866976897921 - 2³⁵ = 13832617159553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13866976897931) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25800885 + ... + 26332861.

Almost surely, 2^{13866976897921} is an apocalyptic number.

13866976897921 is the 3723839-th square number.

13866976897921 is the 1861920-th centered octagonal number.

It is an amenable number.

13866976897921 is a deficient number, since it is larger than the sum of its proper divisors (2264026550978).

13866976897921 is an frugal number, since it uses more digits than its factorization.

13866976897921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063968 (or 531984 counting only the distinct ones).

The product of its digits is 2962842624, while the sum is 82.

The spelling of 13866976897921 in words is "thirteen trillion, eight hundred sixty-six billion, nine hundred seventy-six million, eight hundred ninety-seven thousand, nine hundred twenty-one".