666064358977 has 2 divisors, whose sum is σ = 666064358978. Its totient is φ = 666064358976.

The previous prime is 666064358951. The next prime is 666064359031. The reversal of 666064358977 is 779853460666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 468949670401 + 197114688576 = 684799^2 + 443976^2 .

It is a cyclic number.

It is not a de Polignac number, because 666064358977 - 2²⁷ = 665930141249 is a prime.

It is not a weakly prime, because it can be changed into another prime (666064338977) 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 as a sum of consecutive naturals, namely, 333032179488 + 333032179489.

It is an arithmetic number, because the mean of its divisors is an integer number (333032179489).

Almost surely, 2^666064358977 is an apocalyptic number.

It is an amenable number.

666064358977 is a deficient number, since it is larger than the sum of its proper divisors (1).

666064358977 is an equidigital number, since it uses as much as digits as its factorization.

666064358977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 274337280, while the sum is 67.

The spelling of 666064358977 in words is "six hundred sixty-six billion, sixty-four million, three hundred fifty-eight thousand, nine hundred seventy-seven".