13645726847 has 4 divisors (see below), whose sum is σ = 14085911616. Its totient is φ = 13205542080.

The previous prime is 13645726841. The next prime is 13645726849. The reversal of 13645726847 is 74862754631.

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

It is a cyclic number.

It is not a de Polignac number, because 13645726847 - 2¹⁶ = 13645661311 is a prime.

It is a super-2 number, since 2×13645726847² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13645726841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220092338 + ... + 220092399.

It is an arithmetic number, because the mean of its divisors is an integer number (3521477904).

Almost surely, 2^13645726847 is an apocalyptic number.

13645726847 is a deficient number, since it is larger than the sum of its proper divisors (440184769).

13645726847 is an equidigital number, since it uses as much as digits as its factorization.

13645726847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440184768.

The product of its digits is 6773760, while the sum is 53.

The spelling of 13645726847 in words is "thirteen billion, six hundred forty-five million, seven hundred twenty-six thousand, eight hundred forty-seven".