1166868721845 has 96 divisors (see below), whose sum is σ = 2143603537920. Its totient is φ = 585543530880.

The previous prime is 1166868721831. The next prime is 1166868721853. The reversal of 1166868721845 is 5481278686611.

It is a happy number.

It is not a de Polignac number, because 1166868721845 - 2⁸ = 1166868721589 is a prime.

It is a super-2 number, since 2×1166868721845² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 322070704 + ... + 322074326.

It is an arithmetic number, because the mean of its divisors is an integer number (22329203520).

Almost surely, 2^{1166868721845} is an apocalyptic number.

1166868721845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1166868721845 is a deficient number, since it is larger than the sum of its proper divisors (976734816075).

1166868721845 is a wasteful number, since it uses less digits than its factorization.

1166868721845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6127 (or 6124 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 63.

The spelling of 1166868721845 in words is "one trillion, one hundred sixty-six billion, eight hundred sixty-eight million, seven hundred twenty-one thousand, eight hundred forty-five".