66747539 has 2 divisors, whose sum is σ = 66747540. Its totient is φ = 66747538.

The previous prime is 66747533. The next prime is 66747547. The reversal of 66747539 is 93574766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66747539 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 66747493 and 66747502.

It is not a weakly prime, because it can be changed into another prime (66747533) 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, 33373769 + 33373770.

It is an arithmetic number, because the mean of its divisors is an integer number (33373770).

Almost surely, 2^66747539 is an apocalyptic number.

66747539 is a deficient number, since it is larger than the sum of its proper divisors (1).

66747539 is an equidigital number, since it uses as much as digits as its factorization.

66747539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 47.

The square root of 66747539 is about 8169.9167070418. The cubic root of 66747539 is about 405.6440274059.

The spelling of 66747539 in words is "sixty-six million, seven hundred forty-seven thousand, five hundred thirty-nine".