66116811 has 16 divisors (see below), whose sum is σ = 90097920. Its totient is φ = 43112160.

The previous prime is 66116797. The next prime is 66116819. The reversal of 66116811 is 11861166.

It is a happy number.

It is not a de Polignac number, because 66116811 - 2⁶ = 66116747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66116819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100000 + ... + 100658.

It is an arithmetic number, because the mean of its divisors is an integer number (5631120).

Almost surely, 2^66116811 is an apocalyptic number.

66116811 is a deficient number, since it is larger than the sum of its proper divisors (23981109).

66116811 is a wasteful number, since it uses less digits than its factorization.

66116811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346.

The product of its digits is 1728, while the sum is 30.

The square root of 66116811 is about 8131.2244465394. The cubic root of 66116811 is about 404.3622763384.

Adding to 66116811 its reverse (11861166), we get a palindrome (77977977).

The spelling of 66116811 in words is "sixty-six million, one hundred sixteen thousand, eight hundred eleven".