66122507779 has 2 divisors, whose sum is σ = 66122507780. Its totient is φ = 66122507778.

The previous prime is 66122507741. The next prime is 66122507797. The reversal of 66122507779 is 97770522166.

66122507779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (66122507797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66122507779 is a prime.

It is not a weakly prime, because it can be changed into another prime (66122507719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33061253889 + 33061253890.

It is an arithmetic number, because the mean of its divisors is an integer number (33061253890).

Almost surely, 2^66122507779 is an apocalyptic number.

66122507779 is a deficient number, since it is larger than the sum of its proper divisors (1).

66122507779 is an equidigital number, since it uses as much as digits as its factorization.

66122507779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2222640, while the sum is 52.

The spelling of 66122507779 in words is "sixty-six billion, one hundred twenty-two million, five hundred seven thousand, seven hundred seventy-nine".