66557804540179 has 32 divisors (see below), whose sum is σ = 71785637250560. Its totient is φ = 61584837580800.

The previous prime is 66557804540159. The next prime is 66557804540189. The reversal of 66557804540179 is 97104540875566.

It is a cyclic number.

It is not a de Polignac number, because 66557804540179 - 2¹¹ = 66557804538131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66557804540159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74349787 + ... + 75239659.

It is an arithmetic number, because the mean of its divisors is an integer number (2243301164080).

Almost surely, 2^{66557804540179} is an apocalyptic number.

66557804540179 is a deficient number, since it is larger than the sum of its proper divisors (5227832710381).

66557804540179 is a wasteful number, since it uses less digits than its factorization.

66557804540179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891071.

The product of its (nonzero) digits is 254016000, while the sum is 67.

The spelling of 66557804540179 in words is "sixty-six trillion, five hundred fifty-seven billion, eight hundred four million, five hundred forty thousand, one hundred seventy-nine".