66124649 has 2 divisors, whose sum is σ = 66124650. Its totient is φ = 66124648.

The previous prime is 66124637. The next prime is 66124687. The reversal of 66124649 is 94642166.

It is a happy number.

It is an a-pointer prime, because the next prime (66124687) can be obtained adding 66124649 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60171049 + 5953600 = 7757^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 66124649 - 2⁴ = 66124633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66124049) 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, 33062324 + 33062325.

It is an arithmetic number, because the mean of its divisors is an integer number (33062325).

Almost surely, 2^66124649 is an apocalyptic number.

It is an amenable number.

66124649 is a deficient number, since it is larger than the sum of its proper divisors (1).

66124649 is an equidigital number, since it uses as much as digits as its factorization.

66124649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 38.

The square root of 66124649 is about 8131.7064014879. The cubic root of 66124649 is about 404.3782544547.

The spelling of 66124649 in words is "sixty-six million, one hundred twenty-four thousand, six hundred forty-nine".