6663024078221 has 6 divisors (see below), whose sum is σ = 7750864744110. Its totient is φ = 5711163495576.

The previous prime is 6663024078071. The next prime is 6663024078247. The reversal of 6663024078221 is 1228704203666.

It can be written as a sum of positive squares in only one way, i.e., 4331035480996 + 2331988597225 = 2081114^2 + 1527085^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6663024078221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663024078281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67990041566 + ... + 67990041663.

It is an arithmetic number, because the mean of its divisors is an integer number (1291810790685).

Almost surely, 2^{6663024078221} is an apocalyptic number.

It is an amenable number.

6663024078221 is a deficient number, since it is larger than the sum of its proper divisors (1087840665889).

6663024078221 is a wasteful number, since it uses less digits than its factorization.

6663024078221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135980083243 (or 135980083236 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 47.

The spelling of 6663024078221 in words is "six trillion, six hundred sixty-three billion, twenty-four million, seventy-eight thousand, two hundred twenty-one".