66727171837 has 2 divisors, whose sum is σ = 66727171838. Its totient is φ = 66727171836.

The previous prime is 66727171817. The next prime is 66727171853. The reversal of 66727171837 is 73817172766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63890650756 + 2836521081 = 252766^2 + 53259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66727171837 is a prime.

It is a super-2 number, since 2×66727171837² (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 (66727171817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33363585918 + 33363585919.

It is an arithmetic number, because the mean of its divisors is an integer number (33363585919).

Almost surely, 2^66727171837 is an apocalyptic number.

It is an amenable number.

66727171837 is a deficient number, since it is larger than the sum of its proper divisors (1).

66727171837 is an equidigital number, since it uses as much as digits as its factorization.

66727171837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4148928, while the sum is 55.

The spelling of 66727171837 in words is "sixty-six billion, seven hundred twenty-seven million, one hundred seventy-one thousand, eight hundred thirty-seven".