66106091813 has 2 divisors, whose sum is σ = 66106091814. Its totient is φ = 66106091812.

The previous prime is 66106091801. The next prime is 66106091833. The reversal of 66106091813 is 31819060166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64799775364 + 1306316449 = 254558^2 + 36143^2 .

It is a cyclic number.

It is not a de Polignac number, because 66106091813 - 2¹² = 66106087717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66106091833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33053045906 + 33053045907.

It is an arithmetic number, because the mean of its divisors is an integer number (33053045907).

Almost surely, 2^66106091813 is an apocalyptic number.

It is an amenable number.

66106091813 is a deficient number, since it is larger than the sum of its proper divisors (1).

66106091813 is an equidigital number, since it uses as much as digits as its factorization.

66106091813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The spelling of 66106091813 in words is "sixty-six billion, one hundred six million, ninety-one thousand, eight hundred thirteen".