66650011 has 4 divisors (see below), whose sum is σ = 66896224. Its totient is φ = 66403800.

The previous prime is 66649993. The next prime is 66650027. The reversal of 66650011 is 11005666.

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 66650011 - 2²³ = 58261403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66680011) 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, 122700 + ... + 123241.

It is an arithmetic number, because the mean of its divisors is an integer number (16724056).

Almost surely, 2^66650011 is an apocalyptic number.

66650011 is a deficient number, since it is larger than the sum of its proper divisors (246213).

66650011 is a wasteful number, since it uses less digits than its factorization.

66650011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246212.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 66650011 is about 8163.9457984482. The cubic root of 66650011 is about 405.4463625160.

Adding to 66650011 its reverse (11005666), we get a palindrome (77655677).

The spelling of 66650011 in words is "sixty-six million, six hundred fifty thousand, eleven".