666727601 has 2 divisors, whose sum is σ = 666727602. Its totient is φ = 666727600.

The previous prime is 666727583. The next prime is 666727619. The reversal of 666727601 is 106727666.

It is a balanced prime because it is at equal distance from previous prime (666727583) and next prime (666727619).

It can be written as a sum of positive squares in only one way, i.e., 656640625 + 10086976 = 25625^2 + 3176^2 .

It is a cyclic number.

It is not a de Polignac number, because 666727601 - 2¹⁴ = 666711217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (666727001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333363800 + 333363801.

It is an arithmetic number, because the mean of its divisors is an integer number (333363801).

Almost surely, 2^666727601 is an apocalyptic number.

It is an amenable number.

666727601 is a deficient number, since it is larger than the sum of its proper divisors (1).

666727601 is an equidigital number, since it uses as much as digits as its factorization.

666727601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 666727601 is about 25821.0689360452. The cubic root of 666727601 is about 873.6070794471.

The spelling of 666727601 in words is "six hundred sixty-six million, seven hundred twenty-seven thousand, six hundred one".