66166611666107 has 2 divisors, whose sum is σ = 66166611666108. Its totient is φ = 66166611666106.

The previous prime is 66166611666073. The next prime is 66166611666121. The reversal of 66166611666107 is 70166611666166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66166611666107 - 2²⁸ = 66166343230651 is a prime.

It is not a weakly prime, because it can be changed into another prime (66166611666187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33083305833053 + 33083305833054.

It is an arithmetic number, because the mean of its divisors is an integer number (33083305833054).

Almost surely, 2^{66166611666107} is an apocalyptic number.

66166611666107 is a deficient number, since it is larger than the sum of its proper divisors (1).

66166611666107 is an equidigital number, since it uses as much as digits as its factorization.

66166611666107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11757312, while the sum is 59.

Adding to 66166611666107 its sum of digits (59), we get a palindrome (66166611666166).

The spelling of 66166611666107 in words is "sixty-six trillion, one hundred sixty-six billion, six hundred eleven million, six hundred sixty-six thousand, one hundred seven".