66829127909 has 2 divisors, whose sum is σ = 66829127910. Its totient is φ = 66829127908.

The previous prime is 66829127891. The next prime is 66829127921. The reversal of 66829127909 is 90972192866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61195874884 + 5633253025 = 247378^2 + 75055^2 .

It is a cyclic number.

It is not a de Polignac number, because 66829127909 - 2⁸ = 66829127653 is a prime.

It is a super-2 number, since 2×66829127909² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66829327909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33414563954 + 33414563955.

It is an arithmetic number, because the mean of its divisors is an integer number (33414563955).

Almost surely, 2^66829127909 is an apocalyptic number.

It is an amenable number.

66829127909 is a deficient number, since it is larger than the sum of its proper divisors (1).

66829127909 is an equidigital number, since it uses as much as digits as its factorization.

66829127909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5878656, while the sum is 59.

The spelling of 66829127909 in words is "sixty-six billion, eight hundred twenty-nine million, one hundred twenty-seven thousand, nine hundred nine".