1166743465281 has 9 divisors (see below), whose sum is σ = 1685300797219. Its totient is φ = 777826816536.

The previous prime is 1166743465267. The next prime is 1166743465309. The reversal of 1166743465281 is 1825643476611.

The square root of 1166743465281 is 1080159.

It is a perfect power (a square), and thus also a powerful number.

1166743465281 is a `hidden beast` number, since 1 + 1 + 6 + 6 + 74 + 3 + 46 + 528 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 920016680625 + 246726784656 = 959175^2 + 496716^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-1166743465281 is a prime.

It is a super-2 number, since 2×1166743465281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1166743465081) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3060451 + ... + 3420503.

Almost surely, 2^{1166743465281} is an apocalyptic number.

1166743465281 is the 1080159-th square number.

1166743465281 is the 540080-th centered octagonal number.

It is an amenable number.

1166743465281 is a deficient number, since it is larger than the sum of its proper divisors (518557331938).

1166743465281 is an frugal number, since it uses more digits than its factorization.

1166743465281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720112 (or 360056 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 1166743465281 in words is "one trillion, one hundred sixty-six billion, seven hundred forty-three million, four hundred sixty-five thousand, two hundred eighty-one".