6663311032921 has 9 divisors (see below), whose sum is σ = 6885272963583. Its totient is φ = 6448288075560.

The previous prime is 6663311032919. The next prime is 6663311032991. The reversal of 6663311032921 is 1292301133666.

The square root of 6663311032921 is 2581339.

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

It can be written as a sum of positive squares in only one way, i.e., 6378347240521 + 284963792400 = 2525539^2 + 533820^2 .

It is not a de Polignac number, because 6663311032921 - 2¹ = 6663311032919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6663311032991) 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 8 ways as a sum of consecutive naturals, for example, 79979875 + ... + 80063143.

It is an arithmetic number, because the mean of its divisors is an integer number (765030329287).

Almost surely, 2^{6663311032921} is an apocalyptic number.

6663311032921 is the 2581339-th square number.

6663311032921 is the 1290670-th centered octagonal number.

It is an amenable number.

6663311032921 is a deficient number, since it is larger than the sum of its proper divisors (221961930662).

6663311032921 is an frugal number, since it uses more digits than its factorization.

6663311032921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166600 (or 83300 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 43.

The spelling of 6663311032921 in words is "six trillion, six hundred sixty-three billion, three hundred eleven million, thirty-two thousand, nine hundred twenty-one".