66655606 has 16 divisors (see below), whose sum is σ = 106547616. Its totient is φ = 31165056.

The previous prime is 66655573. The next prime is 66655607. The reversal of 66655606 is 60655666.

It is a happy number.

It is a super-2 number, since 2×66655606² = 8885939622454472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66655607) 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, 906 + ... + 11581.

It is an arithmetic number, because the mean of its divisors is an integer number (6659226).

Almost surely, 2^66655606 is an apocalyptic number.

66655606 is a deficient number, since it is larger than the sum of its proper divisors (39892010).

66655606 is a wasteful number, since it uses less digits than its factorization.

66655606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12663.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 66655606 is about 8164.2884564425. The cubic root of 66655606 is about 405.4577073950.

The spelling of 66655606 in words is "sixty-six million, six hundred fifty-five thousand, six hundred six".