11515021526161 has 2 divisors, whose sum is σ = 11515021526162. Its totient is φ = 11515021526160.

The previous prime is 11515021526143. The next prime is 11515021526179. The reversal of 11515021526161 is 16162512051511.

It is a balanced prime because it is at equal distance from previous prime (11515021526143) and next prime (11515021526179).

It can be written as a sum of positive squares in only one way, i.e., 11510793275536 + 4228250625 = 3392756^2 + 65025^2 .

It is a cyclic number.

It is not a de Polignac number, because 11515021526161 - 2⁴³ = 2718928503953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11515021526161.

It is not a weakly prime, because it can be changed into another prime (11515021326161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5757510763080 + 5757510763081.

It is an arithmetic number, because the mean of its divisors is an integer number (5757510763081).

Almost surely, 2^{11515021526161} is an apocalyptic number.

It is an amenable number.

11515021526161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11515021526161 is an equidigital number, since it uses as much as digits as its factorization.

11515021526161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 37.

Adding to 11515021526161 its reverse (16162512051511), we get a palindrome (27677533577672).

The spelling of 11515021526161 in words is "eleven trillion, five hundred fifteen billion, twenty-one million, five hundred twenty-six thousand, one hundred sixty-one".