66790663 has 2 divisors, whose sum is σ = 66790664. Its totient is φ = 66790662.

The previous prime is 66790657. The next prime is 66790679. The reversal of 66790663 is 36609766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66790663 - 2⁵ = 66790631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66790463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33395331 + 33395332.

It is an arithmetic number, because the mean of its divisors is an integer number (33395332).

Almost surely, 2^66790663 is an apocalyptic number.

66790663 is a deficient number, since it is larger than the sum of its proper divisors (1).

66790663 is an equidigital number, since it uses as much as digits as its factorization.

66790663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 66790663 is about 8172.5554754924. Note that the first 3 decimals coincide. The cubic root of 66790663 is about 405.7313675904.

The spelling of 66790663 in words is "sixty-six million, seven hundred ninety thousand, six hundred sixty-three".