66676447 has 2 divisors, whose sum is σ = 66676448. Its totient is φ = 66676446.

The previous prime is 66676429. The next prime is 66676469. The reversal of 66676447 is 74467666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66676447 - 2¹⁹ = 66152159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66676397 and 66676406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66676427) 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, 33338223 + 33338224.

It is an arithmetic number, because the mean of its divisors is an integer number (33338224).

Almost surely, 2^66676447 is an apocalyptic number.

66676447 is a deficient number, since it is larger than the sum of its proper divisors (1).

66676447 is an equidigital number, since it uses as much as digits as its factorization.

66676447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 46.

The square root of 66676447 is about 8165.5647079672. The cubic root of 66676447 is about 405.4999607230.

The spelling of 66676447 in words is "sixty-six million, six hundred seventy-six thousand, four hundred forty-seven".