66580805633 has 2 divisors, whose sum is σ = 66580805634. Its totient is φ = 66580805632.

The previous prime is 66580805591. The next prime is 66580805639. The reversal of 66580805633 is 33650808566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62826425104 + 3754380529 = 250652^2 + 61273^2 .

It is a cyclic number.

It is not a de Polignac number, because 66580805633 - 2⁶ = 66580805569 is a prime.

It is not a weakly prime, because it can be changed into another prime (66580805639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33290402816 + 33290402817.

It is an arithmetic number, because the mean of its divisors is an integer number (33290402817).

Almost surely, 2^66580805633 is an apocalyptic number.

It is an amenable number.

66580805633 is a deficient number, since it is larger than the sum of its proper divisors (1).

66580805633 is an equidigital number, since it uses as much as digits as its factorization.

66580805633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 66580805633 in words is "sixty-six billion, five hundred eighty million, eight hundred five thousand, six hundred thirty-three".