6665544455665 has 8 divisors (see below), whose sum is σ = 8056197616320. Its totient is φ = 5294072718192.

The previous prime is 6665544455659. The next prime is 6665544455737. The reversal of 6665544455665 is 5665544455666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6665544455665 - 2³ = 6665544455657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6665544455665.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4795355029 + ... + 4795356418.

It is an arithmetic number, because the mean of its divisors is an integer number (1007024702040).

Almost surely, 2^{6665544455665} is an apocalyptic number.

It is an amenable number.

6665544455665 is a deficient number, since it is larger than the sum of its proper divisors (1390653160655).

6665544455665 is a wasteful number, since it uses less digits than its factorization.

6665544455665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9590711591.

The product of its digits is 1555200000, while the sum is 67.

Subtracting from 6665544455665 its reverse (5665544455666), we obtain a palindrome (999999999999).

The spelling of 6665544455665 in words is "six trillion, six hundred sixty-five billion, five hundred forty-four million, four hundred fifty-five thousand, six hundred sixty-five".