66807297841 has 2 divisors, whose sum is σ = 66807297842. Its totient is φ = 66807297840.

The previous prime is 66807297839. The next prime is 66807297857. The reversal of 66807297841 is 14879270866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66807257841 + 40000 = 258471^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 66807297841 - 2¹ = 66807297839 is a prime.

It is a super-2 number, since 2×66807297841² (a number of 22 digits) contains 22 as substring.

Together with 66807297839, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66807297881) 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, 33403648920 + 33403648921.

It is an arithmetic number, because the mean of its divisors is an integer number (33403648921).

Almost surely, 2^66807297841 is an apocalyptic number.

It is an amenable number.

66807297841 is a deficient number, since it is larger than the sum of its proper divisors (1).

66807297841 is an equidigital number, since it uses as much as digits as its factorization.

66807297841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 66807297841 in words is "sixty-six billion, eight hundred seven million, two hundred ninety-seven thousand, eight hundred forty-one".