13668012257 has 4 divisors (see below), whose sum is σ = 14472012996. Its totient is φ = 12864011520.

The previous prime is 13668012217. The next prime is 13668012263. The reversal of 13668012257 is 75221086631.

13668012257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75221086631 = 231001 ⋅325631.

It can be written as a sum of positive squares in 2 ways, for example, as 10899568801 + 2768443456 = 104401^2 + 52616^2 .

It is not a de Polignac number, because 13668012257 - 2¹² = 13668008161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13668012217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402000344 + ... + 402000377.

It is an arithmetic number, because the mean of its divisors is an integer number (3618003249).

Almost surely, 2^13668012257 is an apocalyptic number.

13668012257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

13668012257 is a deficient number, since it is larger than the sum of its proper divisors (804000739).

13668012257 is an equidigital number, since it uses as much as digits as its factorization.

13668012257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804000738.

The product of its (nonzero) digits is 120960, while the sum is 41.

Adding to 13668012257 its reverse (75221086631), we get a palindrome (88889098888).

The spelling of 13668012257 in words is "thirteen billion, six hundred sixty-eight million, twelve thousand, two hundred fifty-seven".