3648639543321 has 16 divisors (see below), whose sum is σ = 4921251627008. Its totient is φ = 2404368262800.

The previous prime is 3648639543319. The next prime is 3648639543371. The reversal of 3648639543321 is 1233459368463.

It is not a de Polignac number, because 3648639543321 - 2¹ = 3648639543319 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3648639543371) 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 15 ways as a sum of consecutive naturals, for example, 17565535 + ... + 17772036.

It is an arithmetic number, because the mean of its divisors is an integer number (307578226688).

Almost surely, 2^{3648639543321} is an apocalyptic number.

It is an amenable number.

3648639543321 is a deficient number, since it is larger than the sum of its proper divisors (1272612083687).

3648639543321 is a wasteful number, since it uses less digits than its factorization.

3648639543321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35337972.

The product of its digits is 33592320, while the sum is 57.

It can be divided in two parts, 3648639 and 543321, that added together give a triangular number (4191960 = T₂₈₉₅).

The spelling of 3648639543321 in words is "three trillion, six hundred forty-eight billion, six hundred thirty-nine million, five hundred forty-three thousand, three hundred twenty-one".