11115342661 has 4 divisors (see below), whose sum is σ = 11115659052. Its totient is φ = 11115026272.

The previous prime is 11115342647. The next prime is 11115342697. The reversal of 11115342661 is 16624351111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16624351111 = 97 ⋅171385063.

It can be written as a sum of positive squares in 2 ways, for example, as 3700410561 + 7414932100 = 60831^2 + 86110^2 .

It is a cyclic number.

It is not a de Polignac number, because 11115342661 - 2⁹ = 11115342149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11115343661) 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, 97816 + ... + 178321.

It is an arithmetic number, because the mean of its divisors is an integer number (2778914763).

Almost surely, 2^11115342661 is an apocalyptic number.

It is an amenable number.

11115342661 is a deficient number, since it is larger than the sum of its proper divisors (316391).

11115342661 is an equidigital number, since it uses as much as digits as its factorization.

11115342661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316390.

The product of its digits is 4320, while the sum is 31.

Adding to 11115342661 its reverse (16624351111), we get a palindrome (27739693772).

The spelling of 11115342661 in words is "eleven billion, one hundred fifteen million, three hundred forty-two thousand, six hundred sixty-one".