6660420044569 has 2 divisors, whose sum is σ = 6660420044570. Its totient is φ = 6660420044568.

The previous prime is 6660420044549. The next prime is 6660420044687. The reversal of 6660420044569 is 9654400240666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5031766785600 + 1628653258969 = 2243160^2 + 1276187^2 .

It is a cyclic number.

It is not a de Polignac number, because 6660420044569 - 2¹³ = 6660420036377 is a prime.

It is a super-2 number, since 2×6660420044569² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6660420044549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330210022284 + 3330210022285.

It is an arithmetic number, because the mean of its divisors is an integer number (3330210022285).

Almost surely, 2^{6660420044569} is an apocalyptic number.

It is an amenable number.

6660420044569 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660420044569 is an equidigital number, since it uses as much as digits as its factorization.

6660420044569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7464960, while the sum is 52.

The spelling of 6660420044569 in words is "six trillion, six hundred sixty billion, four hundred twenty million, forty-four thousand, five hundred sixty-nine".