66505411 has 8 divisors (see below), whose sum is σ = 80477280. Its totient is φ = 53651328.

The previous prime is 66505393. The next prime is 66505421. The reversal of 66505411 is 11450566.

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 66505411 - 2⁵ = 66505379 is a prime.

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 66505411.

It is not an unprimeable number, because it can be changed into a prime (66505421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279316 + ... + 279553.

It is an arithmetic number, because the mean of its divisors is an integer number (10059660).

Almost surely, 2^66505411 is an apocalyptic number.

66505411 is a deficient number, since it is larger than the sum of its proper divisors (13971869).

66505411 is a wasteful number, since it uses less digits than its factorization.

66505411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558893.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 66505411 is about 8155.0849780980. The cubic root of 66505411 is about 405.1529392411.

Adding to 66505411 its reverse (11450566), we get a palindrome (77955977).

The spelling of 66505411 in words is "sixty-six million, five hundred five thousand, four hundred eleven".