15135543375257 has 2 divisors, whose sum is σ = 15135543375258. Its totient is φ = 15135543375256.

The previous prime is 15135543375223. The next prime is 15135543375259. The reversal of 15135543375257 is 75257334553151.

15135543375257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11677501879696 + 3458041495561 = 3417236^2 + 1859581^2 .

It is an emirp because it is prime and its reverse (75257334553151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15135543375257 - 2²⁸ = 15135274939801 is a prime.

Together with 15135543375259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15135543375259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7567771687628 + 7567771687629.

It is an arithmetic number, because the mean of its divisors is an integer number (7567771687629).

Almost surely, 2^{15135543375257} is an apocalyptic number.

It is an amenable number.

15135543375257 is a deficient number, since it is larger than the sum of its proper divisors (1).

15135543375257 is an equidigital number, since it uses as much as digits as its factorization.

15135543375257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33075000, while the sum is 56.

The spelling of 15135543375257 in words is "fifteen trillion, one hundred thirty-five billion, five hundred forty-three million, three hundred seventy-five thousand, two hundred fifty-seven".