66554633 has 2 divisors, whose sum is σ = 66554634. Its totient is φ = 66554632.

The previous prime is 66554597. The next prime is 66554639. The reversal of 66554633 is 33645566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53392249 + 13162384 = 7307^2 + 3628^2 .

It is a cyclic number.

It is not a de Polignac number, because 66554633 - 2¹² = 66550537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66554639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33277316 + 33277317.

It is an arithmetic number, because the mean of its divisors is an integer number (33277317).

Almost surely, 2^66554633 is an apocalyptic number.

It is an amenable number.

66554633 is a deficient number, since it is larger than the sum of its proper divisors (1).

66554633 is an equidigital number, since it uses as much as digits as its factorization.

66554633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 38.

The square root of 66554633 is about 8158.1022915872. The cubic root of 66554633 is about 405.2528685540.

The spelling of 66554633 in words is "sixty-six million, five hundred fifty-four thousand, six hundred thirty-three".