13686825156481 has 4 divisors (see below), whose sum is σ = 13827926446852. Its totient is φ = 13545723866112.

The previous prime is 13686825156463. The next prime is 13686825156527. The reversal of 13686825156481 is 18465152868631.

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 5666261312881 + 8020563843600 = 2380391^2 + 2832060^2 .

It is a cyclic number.

It is not a de Polignac number, because 13686825156481 - 2²⁵ = 13686791602049 is a prime.

It is a super-2 number, since 2×13686825156481² (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 (13686825156181) 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, 70550645040 + ... + 70550645233.

It is an arithmetic number, because the mean of its divisors is an integer number (3456981611713).

Almost surely, 2^{13686825156481} is an apocalyptic number.

It is an amenable number.

13686825156481 is a deficient number, since it is larger than the sum of its proper divisors (141101290371).

13686825156481 is an equidigital number, since it uses as much as digits as its factorization.

13686825156481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141101290370.

The product of its digits is 66355200, while the sum is 64.

The spelling of 13686825156481 in words is "thirteen trillion, six hundred eighty-six billion, eight hundred twenty-five million, one hundred fifty-six thousand, four hundred eighty-one".