66006666701 has 2 divisors, whose sum is σ = 66006666702. Its totient is φ = 66006666700.

The previous prime is 66006666623. The next prime is 66006666727. The reversal of 66006666701 is 10766660066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62918197225 + 3088469476 = 250835^2 + 55574^2 .

It is a cyclic number.

It is not a de Polignac number, because 66006666701 - 2³⁰ = 64932924877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66006626701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33003333350 + 33003333351.

It is an arithmetic number, because the mean of its divisors is an integer number (33003333351).

Almost surely, 2^66006666701 is an apocalyptic number.

It is an amenable number.

66006666701 is a deficient number, since it is larger than the sum of its proper divisors (1).

66006666701 is an equidigital number, since it uses as much as digits as its factorization.

66006666701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 66006666701 in words is "sixty-six billion, six million, six hundred sixty-six thousand, seven hundred one".