66070649 has 2 divisors, whose sum is σ = 66070650. Its totient is φ = 66070648.

The previous prime is 66070601. The next prime is 66070699. The reversal of 66070649 is 94607066.

66070649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40386025 + 25684624 = 6355^2 + 5068^2 .

It is a cyclic number.

It is not a de Polignac number, because 66070649 - 2¹⁶ = 66005113 is a prime.

It is not a weakly prime, because it can be changed into another prime (66070699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33035324 + 33035325.

It is an arithmetic number, because the mean of its divisors is an integer number (33035325).

Almost surely, 2^66070649 is an apocalyptic number.

It is an amenable number.

66070649 is a deficient number, since it is larger than the sum of its proper divisors (1).

66070649 is an equidigital number, since it uses as much as digits as its factorization.

66070649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 66070649 is about 8128.3853870249. The cubic root of 66070649 is about 404.2681473921.

The spelling of 66070649 in words is "sixty-six million, seventy thousand, six hundred forty-nine".