11515161120401 has 4 divisors (see below), whose sum is σ = 11515173944100. Its totient is φ = 11515148296704.

The previous prime is 11515161120349. The next prime is 11515161120409. The reversal of 11515161120401 is 10402116151511.

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 8347476640000 + 3167684480401 = 2889200^2 + 1779799^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11515161120401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11515161120409) 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, 4954496 + ... + 6897633.

It is an arithmetic number, because the mean of its divisors is an integer number (2878793486025).

Almost surely, 2^{11515161120401} is an apocalyptic number.

It is an amenable number.

11515161120401 is a deficient number, since it is larger than the sum of its proper divisors (12823699).

11515161120401 is an equidigital number, since it uses as much as digits as its factorization.

11515161120401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12823698.

The product of its (nonzero) digits is 1200, while the sum is 29.

Adding to 11515161120401 its reverse (10402116151511), we get a palindrome (21917277271912).

The spelling of 11515161120401 in words is "eleven trillion, five hundred fifteen billion, one hundred sixty-one million, one hundred twenty thousand, four hundred one".