3661225845489 has 27 divisors (see below), whose sum is σ = 5581591822443. Its totient is φ = 2312284281984.

The previous prime is 3661225845481. The next prime is 3661225845533. The reversal of 3661225845489 is 9845485221663.

The square root of 3661225845489 is 1913433.

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

3661225845489 is a `hidden beast` number, since 3 + 6 + 6 + 1 + 2 + 2 + 5 + 84 + 548 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 233691995889 + 3427533849600 = 483417^2 + 1851360^2 .

It is not a de Polignac number, because 3661225845489 - 2³ = 3661225845481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3661225845481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 109048897 + ... + 109082465.

Almost surely, 2^{3661225845489} is an apocalyptic number.

3661225845489 is the 1913433-rd square number.

3661225845489 is the 956717-th centered octagonal number.

It is an amenable number.

3661225845489 is a deficient number, since it is larger than the sum of its proper divisors (1920365976954).

3661225845489 is an frugal number, since it uses more digits than its factorization.

3661225845489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67182 (or 33591 counting only the distinct ones).

The product of its digits is 99532800, while the sum is 63.

The spelling of 3661225845489 in words is "three trillion, six hundred sixty-one billion, two hundred twenty-five million, eight hundred forty-five thousand, four hundred eighty-nine".