66655611 has 48 divisors (see below), whose sum is σ = 111541248. Its totient is φ = 37972800.

The previous prime is 66655607. The next prime is 66655613. The reversal of 66655611 is 11655666.

It is not a de Polignac number, because 66655611 - 2² = 66655607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66655613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 113260 + ... + 113846.

It is an arithmetic number, because the mean of its divisors is an integer number (2323776).

Almost surely, 2^66655611 is an apocalyptic number.

66655611 is a deficient number, since it is larger than the sum of its proper divisors (44885637).

66655611 is a wasteful number, since it uses less digits than its factorization.

66655611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 669 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 66655611 is about 8164.2887626541. The cubic root of 66655611 is about 405.4577175331.

Subtracting from 66655611 its reverse (11655666), we obtain a palindrome (54999945).

The spelling of 66655611 in words is "sixty-six million, six hundred fifty-five thousand, six hundred eleven".