66820669784107 has 2 divisors, whose sum is σ = 66820669784108. Its totient is φ = 66820669784106.

The previous prime is 66820669784059. The next prime is 66820669784213. The reversal of 66820669784107 is 70148796602866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66820669784107 - 2¹⁹ = 66820669259819 is a prime.

It is not a weakly prime, because it can be changed into another prime (66820669784507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33410334892053 + 33410334892054.

It is an arithmetic number, because the mean of its divisors is an integer number (33410334892054).

Almost surely, 2^{66820669784107} is an apocalyptic number.

66820669784107 is a deficient number, since it is larger than the sum of its proper divisors (1).

66820669784107 is an equidigital number, since it uses as much as digits as its factorization.

66820669784107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 292626432, while the sum is 70.

The spelling of 66820669784107 in words is "sixty-six trillion, eight hundred twenty billion, six hundred sixty-nine million, seven hundred eighty-four thousand, one hundred seven".