11115240232561 has 4 divisors (see below), whose sum is σ = 11700252876400. Its totient is φ = 10530227588724.

The previous prime is 11115240232553. The next prime is 11115240232567. The reversal of 11115240232561 is 16523204251111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11115240232561 - 2³ = 11115240232553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11115240232567) 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, 292506321891 + ... + 292506321928.

It is an arithmetic number, because the mean of its divisors is an integer number (2925063219100).

Almost surely, 2^{11115240232561} is an apocalyptic number.

It is an amenable number.

11115240232561 is a deficient number, since it is larger than the sum of its proper divisors (585012643839).

11115240232561 is an equidigital number, since it uses as much as digits as its factorization.

11115240232561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585012643838.

The product of its (nonzero) digits is 14400, while the sum is 34.

Adding to 11115240232561 its reverse (16523204251111), we get a palindrome (27638444483672).

The spelling of 11115240232561 in words is "eleven trillion, one hundred fifteen billion, two hundred forty million, two hundred thirty-two thousand, five hundred sixty-one".