1166317921444 has 81 divisors (see below), whose sum is σ = 2244773663433. Its totient is φ = 529993511424.

The previous prime is 1166317921427. The next prime is 1166317921463. The reversal of 1166317921444 is 4441297136611.

The square root of 1166317921444 is 1079962.

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

It can be written as a sum of positive squares in 13 ways, for example, as 1155758303844 + 10559617600 = 1075062^2 + 102760^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2049767592 + ... + 2049768160.

Almost surely, 2^{1166317921444} is an apocalyptic number.

1166317921444 is the 1079962-nd square number.

It is an amenable number.

1166317921444 is a deficient number, since it is larger than the sum of its proper divisors (1078455741989).

1166317921444 is an frugal number, since it uses more digits than its factorization.

1166317921444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314 (or 657 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

Multiplying 1166317921444 by its sum of digits (49), we get a square (57149578150756 = 7559734²).

The spelling of 1166317921444 in words is "one trillion, one hundred sixty-six billion, three hundred seventeen million, nine hundred twenty-one thousand, four hundred forty-four".