66467761 has 2 divisors, whose sum is σ = 66467762. Its totient is φ = 66467760.

The previous prime is 66467759. The next prime is 66467767. The reversal of 66467761 is 16776466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66341025 + 126736 = 8145^2 + 356^2 .

It is a cyclic number.

It is not a de Polignac number, because 66467761 - 2¹ = 66467759 is a prime.

Together with 66467759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66467767) 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, 33233880 + 33233881.

It is an arithmetic number, because the mean of its divisors is an integer number (33233881).

Almost surely, 2^66467761 is an apocalyptic number.

It is an amenable number.

66467761 is a deficient number, since it is larger than the sum of its proper divisors (1).

66467761 is an equidigital number, since it uses as much as digits as its factorization.

66467761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 43.

The square root of 66467761 is about 8152.7762756008. The cubic root of 66467761 is about 405.0764698363.

The spelling of 66467761 in words is "sixty-six million, four hundred sixty-seven thousand, seven hundred sixty-one".