66743687 has 2 divisors, whose sum is σ = 66743688. Its totient is φ = 66743686.

The previous prime is 66743659. The next prime is 66743693. The reversal of 66743687 is 78634766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66743687 - 2¹⁴ = 66727303 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 (66743617) 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, 33371843 + 33371844.

It is an arithmetic number, because the mean of its divisors is an integer number (33371844).

Almost surely, 2^66743687 is an apocalyptic number.

66743687 is a deficient number, since it is larger than the sum of its proper divisors (1).

66743687 is an equidigital number, since it uses as much as digits as its factorization.

66743687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 47.

The square root of 66743687 is about 8169.6809607230. The cubic root of 66743687 is about 405.6362240178.

The spelling of 66743687 in words is "sixty-six million, seven hundred forty-three thousand, six hundred eighty-seven".