66777353 has 2 divisors, whose sum is σ = 66777354. Its totient is φ = 66777352.

The previous prime is 66777331. The next prime is 66777383. The reversal of 66777353 is 35377766.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64850809 + 1926544 = 8053^2 + 1388^2 .

It is a cyclic number.

It is not a de Polignac number, because 66777353 - 2⁶ = 66777289 is a prime.

It is not a weakly prime, because it can be changed into another prime (66777313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33388676 + 33388677.

It is an arithmetic number, because the mean of its divisors is an integer number (33388677).

Almost surely, 2^66777353 is an apocalyptic number.

It is an amenable number.

66777353 is a deficient number, since it is larger than the sum of its proper divisors (1).

66777353 is an equidigital number, since it uses as much as digits as its factorization.

66777353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 555660, while the sum is 44.

The square root of 66777353 is about 8171.7411241424. The cubic root of 66777353 is about 405.7044145053.

The spelling of 66777353 in words is "sixty-six million, seven hundred seventy-seven thousand, three hundred fifty-three".