1166115651666 has 16 divisors (see below), whose sum is σ = 2665407203904. Its totient is φ = 333175900464.

The previous prime is 1166115651653. The next prime is 1166115651709. The reversal of 1166115651666 is 6661565116611.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13882329145 + ... + 13882329228.

It is an arithmetic number, because the mean of its divisors is an integer number (166587950244).

Almost surely, 2^{1166115651666} is an apocalyptic number.

1166115651666 is an abundant number, since it is smaller than the sum of its proper divisors (1499291552238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1166115651666 is a wasteful number, since it uses less digits than its factorization.

1166115651666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27764658385.

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

The spelling of 1166115651666 in words is "one trillion, one hundred sixty-six billion, one hundred fifteen million, six hundred fifty-one thousand, six hundred sixty-six".