11661616565061 has 16 divisors (see below), whose sum is σ = 15781025315328. Its totient is φ = 7658311359600.

The previous prime is 11661616565059. The next prime is 11661616565069. The reversal of 11661616565061 is 16056561616611.

It is not a de Polignac number, because 11661616565061 - 2¹ = 11661616565059 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11661616564995 and 11661616565013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661616565069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45537706 + ... + 45793076.

It is an arithmetic number, because the mean of its divisors is an integer number (986314082208).

Almost surely, 2^{11661616565061} is an apocalyptic number.

It is an amenable number.

11661616565061 is a deficient number, since it is larger than the sum of its proper divisors (4119408750267).

11661616565061 is a wasteful number, since it uses less digits than its factorization.

11661616565061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482632.

The product of its (nonzero) digits is 1166400, while the sum is 51.

The spelling of 11661616565061 in words is "eleven trillion, six hundred sixty-one billion, six hundred sixteen million, five hundred sixty-five thousand, sixty-one".