6611235018821 has 2 divisors, whose sum is σ = 6611235018822. Its totient is φ = 6611235018820.

The previous prime is 6611235018811. The next prime is 6611235018841. The reversal of 6611235018821 is 1288105321166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6600860577796 + 10374441025 = 2569214^2 + 101855^2 .

It is a cyclic number.

It is not a de Polignac number, because 6611235018821 - 2¹⁰ = 6611235017797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6611235018811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305617509410 + 3305617509411.

It is an arithmetic number, because the mean of its divisors is an integer number (3305617509411).

Almost surely, 2^{6611235018821} is an apocalyptic number.

It is an amenable number.

6611235018821 is a deficient number, since it is larger than the sum of its proper divisors (1).

6611235018821 is an equidigital number, since it uses as much as digits as its factorization.

6611235018821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 6611235018821 in words is "six trillion, six hundred eleven billion, two hundred thirty-five million, eighteen thousand, eight hundred twenty-one".