66643126027 has 4 divisors (see below), whose sum is σ = 66656706640. Its totient is φ = 66629545416.

The previous prime is 66643126021. The next prime is 66643126057. The reversal of 66643126027 is 72062134666.

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 66643126027 - 2³ = 66643126019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66643126021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6782943 + ... + 6792760.

It is an arithmetic number, because the mean of its divisors is an integer number (16664176660).

Almost surely, 2^66643126027 is an apocalyptic number.

66643126027 is a deficient number, since it is larger than the sum of its proper divisors (13580613).

66643126027 is a wasteful number, since it uses less digits than its factorization.

66643126027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13580612.

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 66643126027 in words is "sixty-six billion, six hundred forty-three million, one hundred twenty-six thousand, twenty-seven".