11040015661 has 4 divisors (see below), whose sum is σ = 11040346492. Its totient is φ = 11039684832.

The previous prime is 11040015653. The next prime is 11040015689. The reversal of 11040015661 is 16651004011.

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 4234755625 + 6805260036 = 65075^2 + 82494^2 .

It is a cyclic number.

It is not a de Polignac number, because 11040015661 - 2³ = 11040015653 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 (11040015601) 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, 108930 + ... + 184243.

It is an arithmetic number, because the mean of its divisors is an integer number (2760086623).

Almost surely, 2^11040015661 is an apocalyptic number.

It is an amenable number.

11040015661 is a deficient number, since it is larger than the sum of its proper divisors (330831).

11040015661 is an equidigital number, since it uses as much as digits as its factorization.

11040015661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330830.

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 11040015661 its reverse (16651004011), we get a palindrome (27691019672).

The spelling of 11040015661 in words is "eleven billion, forty million, fifteen thousand, six hundred sixty-one".