66666611 has 8 divisors (see below), whose sum is σ = 76555200. Its totient is φ = 57416040.

The previous prime is 66666569. The next prime is 66666629. The reversal of 66666611 is 11666666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66666611 - 2²² = 62472307 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66666631) 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, 159281 + ... + 159698.

It is an arithmetic number, because the mean of its divisors is an integer number (9569400).

Almost surely, 2^66666611 is an apocalyptic number.

66666611 is a deficient number, since it is larger than the sum of its proper divisors (9888589).

66666611 is a wasteful number, since it uses less digits than its factorization.

66666611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319009.

The product of its digits is 46656, while the sum is 38.

The square root of 66666611 is about 8164.9624004033. The cubic root of 66666611 is about 405.4800201796.

Subtracting from 66666611 its reverse (11666666), we obtain a palindrome (54999945).

The spelling of 66666611 in words is "sixty-six million, six hundred sixty-six thousand, six hundred eleven".