66538844107 has 2 divisors, whose sum is σ = 66538844108. Its totient is φ = 66538844106.

The previous prime is 66538844051. The next prime is 66538844153. The reversal of 66538844107 is 70144883566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66538844107 is a prime.

It is not a weakly prime, because it can be changed into another prime (66538814107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33269422053 + 33269422054.

It is an arithmetic number, because the mean of its divisors is an integer number (33269422054).

Almost surely, 2^66538844107 is an apocalyptic number.

66538844107 is a deficient number, since it is larger than the sum of its proper divisors (1).

66538844107 is an equidigital number, since it uses as much as digits as its factorization.

66538844107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3870720, while the sum is 52.

The spelling of 66538844107 in words is "sixty-six billion, five hundred thirty-eight million, eight hundred forty-four thousand, one hundred seven".