66797799553 has 2 divisors, whose sum is σ = 66797799554. Its totient is φ = 66797799552.

The previous prime is 66797799533. The next prime is 66797799587. The reversal of 66797799553 is 35599779766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66704425984 + 93373569 = 258272^2 + 9663^2 .

It is a cyclic number.

It is not a de Polignac number, because 66797799553 - 2¹⁷ = 66797668481 is a prime.

It is not a weakly prime, because it can be changed into another prime (66797799533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33398899776 + 33398899777.

It is an arithmetic number, because the mean of its divisors is an integer number (33398899777).

Almost surely, 2^66797799553 is an apocalyptic number.

It is an amenable number.

66797799553 is a deficient number, since it is larger than the sum of its proper divisors (1).

66797799553 is an equidigital number, since it uses as much as digits as its factorization.

66797799553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 675126900, while the sum is 73.

The spelling of 66797799553 in words is "sixty-six billion, seven hundred ninety-seven million, seven hundred ninety-nine thousand, five hundred fifty-three".