66053681857 has 2 divisors, whose sum is σ = 66053681858. Its totient is φ = 66053681856.

The previous prime is 66053681839. The next prime is 66053681893. The reversal of 66053681857 is 75818635066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35120259216 + 30933422641 = 187404^2 + 175879^2 .

It is a cyclic number.

It is not a de Polignac number, because 66053681857 - 2¹⁵ = 66053649089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66053681798 and 66053681807.

It is not a weakly prime, because it can be changed into another prime (66053681357) 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, 33026840928 + 33026840929.

It is an arithmetic number, because the mean of its divisors is an integer number (33026840929).

Almost surely, 2^66053681857 is an apocalyptic number.

It is an amenable number.

66053681857 is a deficient number, since it is larger than the sum of its proper divisors (1).

66053681857 is an equidigital number, since it uses as much as digits as its factorization.

66053681857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7257600, while the sum is 55.

The spelling of 66053681857 in words is "sixty-six billion, fifty-three million, six hundred eighty-one thousand, eight hundred fifty-seven".