66780793 has 2 divisors, whose sum is σ = 66780794. Its totient is φ = 66780792.

The previous prime is 66780773. The next prime is 66780803. The reversal of 66780793 is 39708766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38775529 + 28005264 = 6227^2 + 5292^2 .

It is a cyclic number.

It is not a de Polignac number, because 66780793 - 2⁹ = 66780281 is a prime.

It is not a weakly prime, because it can be changed into another prime (66780773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33390396 + 33390397.

It is an arithmetic number, because the mean of its divisors is an integer number (33390397).

Almost surely, 2^66780793 is an apocalyptic number.

It is an amenable number.

66780793 is a deficient number, since it is larger than the sum of its proper divisors (1).

66780793 is an equidigital number, since it uses as much as digits as its factorization.

66780793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 66780793 is about 8171.9516028914. The cubic root of 66780793 is about 405.7113809351.

The spelling of 66780793 in words is "sixty-six million, seven hundred eighty thousand, seven hundred ninety-three".