66110629927861 has 2 divisors, whose sum is σ = 66110629927862. Its totient is φ = 66110629927860.

The previous prime is 66110629927781. The next prime is 66110629927883. The reversal of 66110629927861 is 16872992601166.

66110629927861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58944466900900 + 7166163026961 = 7677530^2 + 2676969^2 .

It is a cyclic number.

It is not a de Polignac number, because 66110629927861 - 2⁷ = 66110629927733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66110629927793 and 66110629927802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66110629925861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33055314963930 + 33055314963931.

It is an arithmetic number, because the mean of its divisors is an integer number (33055314963931).

Almost surely, 2^{66110629927861} is an apocalyptic number.

It is an amenable number.

66110629927861 is a deficient number, since it is larger than the sum of its proper divisors (1).

66110629927861 is an equidigital number, since it uses as much as digits as its factorization.

66110629927861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23514624, while the sum is 64.

The spelling of 66110629927861 in words is "sixty-six trillion, one hundred ten billion, six hundred twenty-nine million, nine hundred twenty-seven thousand, eight hundred sixty-one".