6661772774353 has 2 divisors, whose sum is σ = 6661772774354. Its totient is φ = 6661772774352.

The previous prime is 6661772774341. The next prime is 6661772774369. The reversal of 6661772774353 is 3534772771666.

It is a happy number.

6661772774353 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4870597405249 + 1791175369104 = 2206943^2 + 1338348^2 .

It is a cyclic number.

It is not a de Polignac number, because 6661772774353 - 2¹³ = 6661772766161 is a prime.

It is a super-2 number, since 2×6661772774353² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6661772774753) 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 as a sum of consecutive naturals, namely, 3330886387176 + 3330886387177.

It is an arithmetic number, because the mean of its divisors is an integer number (3330886387177).

Almost surely, 2^{6661772774353} is an apocalyptic number.

It is an amenable number.

6661772774353 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661772774353 is an equidigital number, since it uses as much as digits as its factorization.

6661772774353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186701760, while the sum is 64.

The spelling of 6661772774353 in words is "six trillion, six hundred sixty-one billion, seven hundred seventy-two million, seven hundred seventy-four thousand, three hundred fifty-three".