3621816253449 has 27 divisors (see below), whose sum is σ = 5295994957357. Its totient is φ = 2385141165816.

The previous prime is 3621816253373. The next prime is 3621816253457. The reversal of 3621816253449 is 9443526181263.

It is a happy number.

The square root of 3621816253449 is 1903107.

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

3621816253449 is a `hidden beast` number, since 3 + 6 + 2 + 1 + 8 + 1 + 62 + 534 + 49 = 666.

It is not a de Polignac number, because 3621816253449 - 2¹⁷ = 3621816122377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3621816253395 and 3621816253404.

It is not an unprimeable number, because it can be changed into a prime (3621816253949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 473869822 + ... + 473877464.

Almost surely, 2^{3621816253449} is an apocalyptic number.

3621816253449 is the 1903107-th square number.

3621816253449 is the 951554-th centered octagonal number.

It is an amenable number.

3621816253449 is a deficient number, since it is larger than the sum of its proper divisors (1674178703908).

3621816253449 is an frugal number, since it uses more digits than its factorization.

3621816253449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15458 (or 7729 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The spelling of 3621816253449 in words is "three trillion, six hundred twenty-one billion, eight hundred sixteen million, two hundred fifty-three thousand, four hundred forty-nine".