6665565561469 has 2 divisors, whose sum is σ = 6665565561470. Its totient is φ = 6665565561468.

The previous prime is 6665565561409. The next prime is 6665565561533. The reversal of 6665565561469 is 9641655655666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5652197179225 + 1013368382244 = 2377435^2 + 1006662^2 .

It is a cyclic number.

It is not a de Polignac number, because 6665565561469 - 2¹¹ = 6665565559421 is a prime.

It is a super-2 number, since 2×6665565561469² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6665565561398 and 6665565561407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6665565561409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332782780734 + 3332782780735.

It is an arithmetic number, because the mean of its divisors is an integer number (3332782780735).

Almost surely, 2^{6665565561469} is an apocalyptic number.

It is an amenable number.

6665565561469 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665565561469 is an equidigital number, since it uses as much as digits as its factorization.

6665565561469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760000, while the sum is 70.

The spelling of 6665565561469 in words is "six trillion, six hundred sixty-five billion, five hundred sixty-five million, five hundred sixty-one thousand, four hundred sixty-nine".