11666043282481 has 27 divisors (see below), whose sum is σ = 13615377453441. Its totient is φ = 9966655810944.

The previous prime is 11666043282449. The next prime is 11666043282511. The reversal of 11666043282481 is 18428234066611.

The square root of 11666043282481 is 3415559.

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

It can be written as a sum of positive squares in 4 ways, for example, as 2693717975025 + 8972325307456 = 1641255^2 + 2995384^2 .

It is not a de Polignac number, because 11666043282481 - 2⁵ = 11666043282449 is a prime.

It is a super-2 number, since 2×11666043282481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11666043282781) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9778744821 + ... + 9778746013.

Almost surely, 2^{11666043282481} is an apocalyptic number.

11666043282481 is the 3415559-th square number.

11666043282481 is the 1707780-th centered octagonal number.

It is an amenable number.

11666043282481 is a deficient number, since it is larger than the sum of its proper divisors (1949334170960).

11666043282481 is an frugal number, since it uses more digits than its factorization.

11666043282481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3218 (or 1609 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 52.

The spelling of 11666043282481 in words is "eleven trillion, six hundred sixty-six billion, forty-three million, two hundred eighty-two thousand, four hundred eighty-one".