11115504661 has 4 divisors (see below), whose sum is σ = 11123554924. Its totient is φ = 11107454400.

The previous prime is 11115504649. The next prime is 11115504671. The reversal of 11115504661 is 16640551111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16640551111 = 31721 ⋅524591.

It can be written as a sum of positive squares in 2 ways, for example, as 8202743761 + 2912760900 = 90569^2 + 53970^2 .

It is a cyclic number.

It is not a de Polignac number, because 11115504661 - 2¹⁵ = 11115471893 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 (11115504641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4023060 + ... + 4025821.

It is an arithmetic number, because the mean of its divisors is an integer number (2780888731).

Almost surely, 2^11115504661 is an apocalyptic number.

It is an amenable number.

11115504661 is a deficient number, since it is larger than the sum of its proper divisors (8050263).

11115504661 is an equidigital number, since it uses as much as digits as its factorization.

11115504661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8050262.

The product of its (nonzero) digits is 3600, while the sum is 31.

The spelling of 11115504661 in words is "eleven billion, one hundred fifteen million, five hundred four thousand, six hundred sixty-one".