66557422079 has 2 divisors, whose sum is σ = 66557422080. Its totient is φ = 66557422078.

The previous prime is 66557422039. The next prime is 66557422091. The reversal of 66557422079 is 97022475566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66557422079 - 2⁸ = 66557421823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66557422079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66557422039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33278711039 + 33278711040.

It is an arithmetic number, because the mean of its divisors is an integer number (33278711040).

Almost surely, 2^66557422079 is an apocalyptic number.

66557422079 is a deficient number, since it is larger than the sum of its proper divisors (1).

66557422079 is an equidigital number, since it uses as much as digits as its factorization.

66557422079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6350400, while the sum is 53.

The spelling of 66557422079 in words is "sixty-six billion, five hundred fifty-seven million, four hundred twenty-two thousand, seventy-nine".