161166560505566 has 32 divisors (see below), whose sum is σ = 301495053477888. Its totient is φ = 62772863387040.

The previous prime is 161166560505523. The next prime is 161166560505571. The reversal of 161166560505566 is 665505065661161.

It is a happy number.

161166560505566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160356110 + ... + 161358033.

It is an arithmetic number, because the mean of its divisors is an integer number (9421720421184).

Almost surely, 2^{161166560505566} is an apocalyptic number.

161166560505566 is a deficient number, since it is larger than the sum of its proper divisors (140328492972322).

161166560505566 is a wasteful number, since it uses less digits than its factorization.

161166560505566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321717416.

The product of its (nonzero) digits is 29160000, while the sum is 59.

The spelling of 161166560505566 in words is "one hundred sixty-one trillion, one hundred sixty-six billion, five hundred sixty million, five hundred five thousand, five hundred sixty-six".