66556044675427 has 4 divisors (see below), whose sum is σ = 67080108019456. Its totient is φ = 66031981331400.

The previous prime is 66556044675359. The next prime is 66556044675451. The reversal of 66556044675427 is 72457644065566.

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 66556044675427 - 2¹⁹ = 66556044151139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66556044675457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262031671824 + ... + 262031672077.

It is an arithmetic number, because the mean of its divisors is an integer number (16770027004864).

Almost surely, 2^{66556044675427} is an apocalyptic number.

66556044675427 is a deficient number, since it is larger than the sum of its proper divisors (524063344029).

66556044675427 is a wasteful number, since it uses less digits than its factorization.

66556044675427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524063344028.

The product of its (nonzero) digits is 1016064000, while the sum is 67.

The spelling of 66556044675427 in words is "sixty-six trillion, five hundred fifty-six billion, forty-four million, six hundred seventy-five thousand, four hundred twenty-seven".