66506411 has 4 divisors (see below), whose sum is σ = 67499112. Its totient is φ = 65513712.

The previous prime is 66506369. The next prime is 66506443. The reversal of 66506411 is 11460566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66506411 - 2¹⁴ = 66490027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66506491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496250 + ... + 496383.

It is an arithmetic number, because the mean of its divisors is an integer number (16874778).

Almost surely, 2^66506411 is an apocalyptic number.

66506411 is a deficient number, since it is larger than the sum of its proper divisors (992701).

66506411 is an equidigital number, since it uses as much as digits as its factorization.

66506411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992700.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 66506411 is about 8155.1462893071. The cubic root of 66506411 is about 405.1549699075.

Adding to 66506411 its reverse (11460566), we get a palindrome (77966977).

The spelling of 66506411 in words is "sixty-six million, five hundred six thousand, four hundred eleven".