66027649 has 2 divisors, whose sum is σ = 66027650. Its totient is φ = 66027648.

The previous prime is 66027623. The next prime is 66027673. The reversal of 66027649 is 94672066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51739249 + 14288400 = 7193^2 + 3780^2 .

It is a cyclic number.

It is not a de Polignac number, because 66027649 - 2⁵ = 66027617 is a prime.

It is not a weakly prime, because it can be changed into another prime (66027749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33013824 + 33013825.

It is an arithmetic number, because the mean of its divisors is an integer number (33013825).

Almost surely, 2^66027649 is an apocalyptic number.

It is an amenable number.

66027649 is a deficient number, since it is larger than the sum of its proper divisors (1).

66027649 is an equidigital number, since it uses as much as digits as its factorization.

66027649 is an evil number, because the sum of its binary digits is even.

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

The square root of 66027649 is about 8125.7399047717. The cubic root of 66027649 is about 404.1804266309.

The spelling of 66027649 in words is "sixty-six million, twenty-seven thousand, six hundred forty-nine".