1166105665000 has 40 divisors (see below), whose sum is σ = 2732185584810. Its totient is φ = 466442264000.

The previous prime is 1166105664991. The next prime is 1166105665001. The reversal of 1166105665000 is 5665016611.

It can be written as a sum of positive squares in 5 ways, for example, as 62937763876 + 1103167901124 = 250874^2 + 1050318^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1166105665001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 116605567 + ... + 116615566.

Almost surely, 2^{1166105665000} is an apocalyptic number.

1166105665000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1166105665000 is an abundant number, since it is smaller than the sum of its proper divisors (1566079919810).

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

1166105665000 is an equidigital number, since it uses as much as digits as its factorization.

1166105665000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233221159 (or 233221140 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 1166105665000 in words is "one trillion, one hundred sixty-six billion, one hundred five million, six hundred sixty-five thousand".