11561616065 has 8 divisors (see below), whose sum is σ = 13874523648. Its totient is φ = 9248903280.

The previous prime is 11561616023. The next prime is 11561616097. The reversal of 11561616065 is 56061616511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11561616065 - 2⁸ = 11561615809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176864 + ... + 233246.

It is an arithmetic number, because the mean of its divisors is an integer number (1734315456).

Almost surely, 2^11561616065 is an apocalyptic number.

It is an amenable number.

11561616065 is a deficient number, since it is larger than the sum of its proper divisors (2312907583).

11561616065 is an equidigital number, since it uses as much as digits as its factorization.

11561616065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97399.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 11561616065 in words is "eleven billion, five hundred sixty-one million, six hundred sixteen thousand, sixty-five".