66270649 has 2 divisors, whose sum is σ = 66270650. Its totient is φ = 66270648.

The previous prime is 66270647. The next prime is 66270707. The reversal of 66270649 is 94607266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65205625 + 1065024 = 8075^2 + 1032^2 .

It is a cyclic number.

It is not a de Polignac number, because 66270649 - 2¹ = 66270647 is a prime.

Together with 66270647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66270643) 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, 33135324 + 33135325.

It is an arithmetic number, because the mean of its divisors is an integer number (33135325).

Almost surely, 2^66270649 is an apocalyptic number.

It is an amenable number.

66270649 is a deficient number, since it is larger than the sum of its proper divisors (1).

66270649 is an equidigital number, since it uses as much as digits as its factorization.

66270649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 66270649 is about 8140.6786572128. The cubic root of 66270649 is about 404.6756515038.

The spelling of 66270649 in words is "sixty-six million, two hundred seventy thousand, six hundred forty-nine".