66546643 has 2 divisors, whose sum is σ = 66546644. Its totient is φ = 66546642.

The previous prime is 66546583. The next prime is 66546673. The reversal of 66546643 is 34664566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66546643 - 2¹⁷ = 66415571 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66546596 and 66546605.

It is not a weakly prime, because it can be changed into another prime (66546673) 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, 33273321 + 33273322.

It is an arithmetic number, because the mean of its divisors is an integer number (33273322).

Almost surely, 2^66546643 is an apocalyptic number.

66546643 is a deficient number, since it is larger than the sum of its proper divisors (1).

66546643 is an equidigital number, since it uses as much as digits as its factorization.

66546643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 40.

The square root of 66546643 is about 8157.6125796706. The cubic root of 66546643 is about 405.2366507999.

The spelling of 66546643 in words is "sixty-six million, five hundred forty-six thousand, six hundred forty-three".