66042811 has 4 divisors (see below), whose sum is σ = 66059352. Its totient is φ = 66026272.

The previous prime is 66042799. The next prime is 66042877. The reversal of 66042811 is 11824066.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 11824066 = 2 ⋅5912033.

It is a cyclic number.

It is not a de Polignac number, because 66042811 - 2¹¹ = 66040763 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 66042811.

It is not an unprimeable number, because it can be changed into a prime (66042311) 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, 1836 + ... + 11638.

It is an arithmetic number, because the mean of its divisors is an integer number (16514838).

Almost surely, 2^66042811 is an apocalyptic number.

66042811 is a deficient number, since it is larger than the sum of its proper divisors (16541).

66042811 is an equidigital number, since it uses as much as digits as its factorization.

66042811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16540.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 66042811 is about 8126.6728124122. The cubic root of 66042811 is about 404.2113617250.

Adding to 66042811 its reverse (11824066), we get a palindrome (77866877).

The spelling of 66042811 in words is "sixty-six million, forty-two thousand, eight hundred eleven".