66648295177 has 2 divisors, whose sum is σ = 66648295178. Its totient is φ = 66648295176.

The previous prime is 66648295163. The next prime is 66648295187. The reversal of 66648295177 is 77159284666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49381283961 + 17267011216 = 222219^2 + 131404^2 .

It is a cyclic number.

It is not a de Polignac number, because 66648295177 - 2²⁷ = 66514077449 is a prime.

It is a super-2 number, since 2×66648295177² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66648295157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33324147588 + 33324147589.

It is an arithmetic number, because the mean of its divisors is an integer number (33324147589).

Almost surely, 2^66648295177 is an apocalyptic number.

It is an amenable number.

66648295177 is a deficient number, since it is larger than the sum of its proper divisors (1).

66648295177 is an equidigital number, since it uses as much as digits as its factorization.

66648295177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30481920, while the sum is 61.

The spelling of 66648295177 in words is "sixty-six billion, six hundred forty-eight million, two hundred ninety-five thousand, one hundred seventy-seven".