66656727 has 24 divisors (see below), whose sum is σ = 100034688. Its totient is φ = 42724800.

The previous prime is 66656683. The next prime is 66656741. The reversal of 66656727 is 72765666.

It is not a de Polignac number, because 66656727 - 2⁶ = 66656663 is a prime.

It is a super-4 number, since 4×66656727⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66656767) 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 23 ways as a sum of consecutive naturals, for example, 47577 + ... + 48957.

It is an arithmetic number, because the mean of its divisors is an integer number (4168112).

Almost surely, 2^66656727 is an apocalyptic number.

66656727 is a deficient number, since it is larger than the sum of its proper divisors (33377961).

66656727 is a wasteful number, since it uses less digits than its factorization.

66656727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591 (or 1588 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 66656727 is about 8164.3571087992. The cubic root of 66656727 is about 405.4599803498.

The spelling of 66656727 in words is "sixty-six million, six hundred fifty-six thousand, seven hundred twenty-seven".