15255115517 has 2 divisors, whose sum is σ = 15255115518. Its totient is φ = 15255115516.

The previous prime is 15255115489. The next prime is 15255115571. The reversal of 15255115517 is 71551155251.

Together with next prime (15255115571) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14739416836 + 515698681 = 121406^2 + 22709^2 .

It is a cyclic number.

It is not a de Polignac number, because 15255115517 - 2¹⁸ = 15254853373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15255115417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7627557758 + 7627557759.

It is an arithmetic number, because the mean of its divisors is an integer number (7627557759).

Almost surely, 2^15255115517 is an apocalyptic number.

It is an amenable number.

15255115517 is a deficient number, since it is larger than the sum of its proper divisors (1).

15255115517 is an equidigital number, since it uses as much as digits as its factorization.

15255115517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43750, while the sum is 38.

The spelling of 15255115517 in words is "fifteen billion, two hundred fifty-five million, one hundred fifteen thousand, five hundred seventeen".