666906701 has 2 divisors, whose sum is σ = 666906702. Its totient is φ = 666906700.

The previous prime is 666906679. The next prime is 666906733. The reversal of 666906701 is 107609666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 559369801 + 107536900 = 23651^2 + 10370^2 .

It is a cyclic number.

It is not a de Polignac number, because 666906701 - 2¹⁴ = 666890317 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666906001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333453350 + 333453351.

It is an arithmetic number, because the mean of its divisors is an integer number (333453351).

Almost surely, 2^666906701 is an apocalyptic number.

It is an amenable number.

666906701 is a deficient number, since it is larger than the sum of its proper divisors (1).

666906701 is an equidigital number, since it uses as much as digits as its factorization.

666906701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 666906701 is about 25824.5368012671. The cubic root of 666906701 is about 873.6852968079.

The spelling of 666906701 in words is "six hundred sixty-six million, nine hundred six thousand, seven hundred one".