3618874647556 has 81 divisors (see below), whose sum is σ = 7826817995199. Its totient is φ = 1459531519488.

The previous prime is 3618874647541. The next prime is 3618874647599. The reversal of 3618874647556 is 6557464788163.

The square root of 3618874647556 is 1902334.

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 126760209156 + 3492114438400 = 356034^2 + 1868720^2 .

It is an unprimeable number.

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, 452751496 + ... + 452759488.

Almost surely, 2^{3618874647556} is an apocalyptic number.

3618874647556 is the 1902334-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3618874647556

3618874647556 is an abundant number, since it is smaller than the sum of its proper divisors (4207943347643).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3618874647556 is an frugal number, since it uses more digits than its factorization.

3618874647556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16038 (or 8019 counting only the distinct ones).

The product of its digits is 812851200, while the sum is 70.

The spelling of 3618874647556 in words is "three trillion, six hundred eighteen billion, eight hundred seventy-four million, six hundred forty-seven thousand, five hundred fifty-six".