66767693 has 2 divisors, whose sum is σ = 66767694. Its totient is φ = 66767692.

The previous prime is 66767671. The next prime is 66767699. The reversal of 66767693 is 39676766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63952009 + 2815684 = 7997^2 + 1678^2 .

It is a cyclic number.

It is not a de Polignac number, because 66767693 - 2⁶ = 66767629 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 (66767699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33383846 + 33383847.

It is an arithmetic number, because the mean of its divisors is an integer number (33383847).

Almost surely, 2^66767693 is an apocalyptic number.

It is an amenable number.

66767693 is a deficient number, since it is larger than the sum of its proper divisors (1).

66767693 is an equidigital number, since it uses as much as digits as its factorization.

66767693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 50.

The square root of 66767693 is about 8171.1500414568. The cubic root of 66767693 is about 405.6848505191.

The spelling of 66767693 in words is "sixty-six million, seven hundred sixty-seven thousand, six hundred ninety-three".