66558974497 has 2 divisors, whose sum is σ = 66558974498. Its totient is φ = 66558974496.

The previous prime is 66558974473. The next prime is 66558974501. The reversal of 66558974497 is 79447985566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61293875776 + 5265098721 = 247576^2 + 72561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66558974497 is a prime.

It is not a weakly prime, because it can be changed into another prime (66558974467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33279487248 + 33279487249.

It is an arithmetic number, because the mean of its divisors is an integer number (33279487249).

Almost surely, 2^66558974497 is an apocalyptic number.

It is an amenable number.

66558974497 is a deficient number, since it is larger than the sum of its proper divisors (1).

66558974497 is an equidigital number, since it uses as much as digits as its factorization.

66558974497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 457228800, while the sum is 70.

The spelling of 66558974497 in words is "sixty-six billion, five hundred fifty-eight million, nine hundred seventy-four thousand, four hundred ninety-seven".