15115136447 has 2 divisors, whose sum is σ = 15115136448. Its totient is φ = 15115136446.

The previous prime is 15115136423. The next prime is 15115136461. The reversal of 15115136447 is 74463151151.

It is a strong prime.

It is an emirp because it is prime and its reverse (74463151151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15115136447 - 2²⁸ = 14846700991 is a prime.

It is a super-2 number, since 2×15115136447² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15115136447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15115136497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7557568223 + 7557568224.

It is an arithmetic number, because the mean of its divisors is an integer number (7557568224).

Almost surely, 2^15115136447 is an apocalyptic number.

15115136447 is a deficient number, since it is larger than the sum of its proper divisors (1).

15115136447 is an equidigital number, since it uses as much as digits as its factorization.

15115136447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 38.

Adding to 15115136447 its reverse (74463151151), we get a palindrome (89578287598).

The spelling of 15115136447 in words is "fifteen billion, one hundred fifteen million, one hundred thirty-six thousand, four hundred forty-seven".