66468208549 has 2 divisors, whose sum is σ = 66468208550. Its totient is φ = 66468208548.

The previous prime is 66468208493. The next prime is 66468208571. The reversal of 66468208549 is 94580286466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63700712100 + 2767496449 = 252390^2 + 52607^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66468208549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66468208493 and 66468208502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66468208349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33234104274 + 33234104275.

It is an arithmetic number, because the mean of its divisors is an integer number (33234104275).

Almost surely, 2^66468208549 is an apocalyptic number.

It is an amenable number.

66468208549 is a deficient number, since it is larger than the sum of its proper divisors (1).

66468208549 is an equidigital number, since it uses as much as digits as its factorization.

66468208549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19906560, while the sum is 58.

The spelling of 66468208549 in words is "sixty-six billion, four hundred sixty-eight million, two hundred eight thousand, five hundred forty-nine".