1161201331666 has 16 divisors (see below), whose sum is σ = 1747613609280. Its totient is φ = 578666396880.

The previous prime is 1161201331651. The next prime is 1161201331669. The reversal of 1161201331666 is 6661331021611.

It is not an unprimeable number, because it can be changed into a prime (1161201331669) 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 7 ways as a sum of consecutive naturals, for example, 58915 + ... + 1525081.

It is an arithmetic number, because the mean of its divisors is an integer number (109225850580).

Almost surely, 2^{1161201331666} is an apocalyptic number.

1161201331666 is a deficient number, since it is larger than the sum of its proper divisors (586412277614).

1161201331666 is a wasteful number, since it uses less digits than its factorization.

1161201331666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467489.

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 1161201331666 in words is "one trillion, one hundred sixty-one billion, two hundred one million, three hundred thirty-one thousand, six hundred sixty-six".