66767741 has 2 divisors, whose sum is σ = 66767742. Its totient is φ = 66767740.

The previous prime is 66767699. The next prime is 66767747. The reversal of 66767741 is 14776766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66765241 + 2500 = 8171^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 66767741 - 2¹⁰ = 66766717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66767692 and 66767701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66767747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33383870 + 33383871.

It is an arithmetic number, because the mean of its divisors is an integer number (33383871).

Almost surely, 2^66767741 is an apocalyptic number.

It is an amenable number.

66767741 is a deficient number, since it is larger than the sum of its proper divisors (1).

66767741 is an equidigital number, since it uses as much as digits as its factorization.

66767741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 296352, while the sum is 44.

The square root of 66767741 is about 8171.1529786194. The cubic root of 66767741 is about 405.6849477362.

The spelling of 66767741 in words is "sixty-six million, seven hundred sixty-seven thousand, seven hundred forty-one".