666907001 has 2 divisors, whose sum is σ = 666907002. Its totient is φ = 666907000.

The previous prime is 666906967. The next prime is 666907027. The reversal of 666907001 is 100709666.

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., 622003600 + 44903401 = 24940^2 + 6701^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666907001 is a prime.

It is not a weakly prime, because it can be changed into another prime (666907051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333453500 + 333453501.

It is an arithmetic number, because the mean of its divisors is an integer number (333453501).

Almost surely, 2^666907001 is an apocalyptic number.

It is an amenable number.

666907001 is a deficient number, since it is larger than the sum of its proper divisors (1).

666907001 is an equidigital number, since it uses as much as digits as its factorization.

666907001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 666907001 is about 25824.5426096959. The cubic root of 666907001 is about 873.6854278135.

The spelling of 666907001 in words is "six hundred sixty-six million, nine hundred seven thousand, one".