666634140577 has 2 divisors, whose sum is σ = 666634140578. Its totient is φ = 666634140576.

The previous prime is 666634140569. The next prime is 666634140671. The reversal of 666634140577 is 775041436666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 535752266401 + 130881874176 = 731951^2 + 361776^2 .

It is a cyclic number.

It is not a de Polignac number, because 666634140577 - 2³ = 666634140569 is a prime.

It is not a weakly prime, because it can be changed into another prime (666634140517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333317070288 + 333317070289.

It is an arithmetic number, because the mean of its divisors is an integer number (333317070289).

Almost surely, 2^666634140577 is an apocalyptic number.

It is an amenable number.

666634140577 is a deficient number, since it is larger than the sum of its proper divisors (1).

666634140577 is an equidigital number, since it uses as much as digits as its factorization.

666634140577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15240960, while the sum is 55.

The spelling of 666634140577 in words is "six hundred sixty-six billion, six hundred thirty-four million, one hundred forty thousand, five hundred seventy-seven".