66743701 has 2 divisors, whose sum is σ = 66743702. Its totient is φ = 66743700.

The previous prime is 66743693. The next prime is 66743737. The reversal of 66743701 is 10734766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65691025 + 1052676 = 8105^2 + 1026^2 .

It is a cyclic number.

It is not a de Polignac number, because 66743701 - 2³ = 66743693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66743741) 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, 33371850 + 33371851.

It is an arithmetic number, because the mean of its divisors is an integer number (33371851).

Almost surely, 2^66743701 is an apocalyptic number.

It is an amenable number.

66743701 is a deficient number, since it is larger than the sum of its proper divisors (1).

66743701 is an equidigital number, since it uses as much as digits as its factorization.

66743701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 66743701 is about 8169.6818175496. The cubic root of 66743701 is about 405.6362523796.

The spelling of 66743701 in words is "sixty-six million, seven hundred forty-three thousand, seven hundred one".