6665565561497 has 16 divisors (see below), whose sum is σ = 7039967126400. Its totient is φ = 6303857915520.

The previous prime is 6665565561469. The next prime is 6665565561533. The reversal of 6665565561497 is 7941655655666.

It is a cyclic number.

It is not a de Polignac number, because 6665565561497 - 2¹⁰ = 6665565560473 is a prime.

It is a super-3 number, since 3×6665565561497³ (a number of 39 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6665565561497.

It is not an unprimeable number, because it can be changed into a prime (6665565563497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16959629 + ... + 17348202.

It is an arithmetic number, because the mean of its divisors is an integer number (439997945400).

Almost surely, 2^{6665565561497} is an apocalyptic number.

It is an amenable number.

6665565561497 is a deficient number, since it is larger than the sum of its proper divisors (374401564903).

6665565561497 is a wasteful number, since it uses less digits than its factorization.

6665565561497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34308016.

The product of its digits is 1224720000, while the sum is 71.

The spelling of 6665565561497 in words is "six trillion, six hundred sixty-five billion, five hundred sixty-five million, five hundred sixty-one thousand, four hundred ninety-seven".