11726172517 has 2 divisors, whose sum is σ = 11726172518. Its totient is φ = 11726172516.

The previous prime is 11726172463. The next prime is 11726172527. The reversal of 11726172517 is 71527162711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11725857796 + 314721 = 108286^2 + 561^2 .

It is an emirp because it is prime and its reverse (71527162711) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11726172517 is a prime.

It is a super-2 number, since 2×11726172517² (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 11726172517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11726172527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5863086258 + 5863086259.

It is an arithmetic number, because the mean of its divisors is an integer number (5863086259).

Almost surely, 2^11726172517 is an apocalyptic number.

It is an amenable number.

11726172517 is a deficient number, since it is larger than the sum of its proper divisors (1).

11726172517 is an equidigital number, since it uses as much as digits as its factorization.

11726172517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41160, while the sum is 40.

The spelling of 11726172517 in words is "eleven billion, seven hundred twenty-six million, one hundred seventy-two thousand, five hundred seventeen".