15135317011517 has 4 divisors (see below), whose sum is σ = 15269257870140. Its totient is φ = 15001376152896.

The previous prime is 15135317011513. The next prime is 15135317011523. The reversal of 15135317011517 is 71511071353151.

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 4811086909561 + 10324230101956 = 2193419^2 + 3213134^2 .

It is a cyclic number.

It is not a de Polignac number, because 15135317011517 - 2² = 15135317011513 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15135317011513) 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, 66970429142 + ... + 66970429367.

It is an arithmetic number, because the mean of its divisors is an integer number (3817314467535).

Almost surely, 2^{15135317011517} is an apocalyptic number.

It is an amenable number.

15135317011517 is a deficient number, since it is larger than the sum of its proper divisors (133940858623).

15135317011517 is a wasteful number, since it uses less digits than its factorization.

15135317011517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133940858622.

The product of its (nonzero) digits is 55125, while the sum is 41.

Adding to 15135317011517 its reverse (71511071353151), we get a palindrome (86646388364668).

The spelling of 15135317011517 in words is "fifteen trillion, one hundred thirty-five billion, three hundred seventeen million, eleven thousand, five hundred seventeen".