11561165166461 has 16 divisors (see below), whose sum is σ = 12009656419200. Its totient is φ = 11116033080768.

The previous prime is 11561165166359. The next prime is 11561165166511. The reversal of 11561165166461 is 16466156116511.

It is a cyclic number.

It is not a de Polignac number, because 11561165166461 - 2¹⁴ = 11561165150077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561165366461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17167280 + ... + 17828006.

It is an arithmetic number, because the mean of its divisors is an integer number (750603526200).

Almost surely, 2^{11561165166461} is an apocalyptic number.

It is an amenable number.

11561165166461 is a deficient number, since it is larger than the sum of its proper divisors (448491252739).

11561165166461 is a wasteful number, since it uses less digits than its factorization.

11561165166461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663268.

The product of its digits is 777600, while the sum is 50.

The spelling of 11561165166461 in words is "eleven trillion, five hundred sixty-one billion, one hundred sixty-five million, one hundred sixty-six thousand, four hundred sixty-one".