66853388783 has 2 divisors, whose sum is σ = 66853388784. Its totient is φ = 66853388782.

The previous prime is 66853388747. The next prime is 66853388837. The reversal of 66853388783 is 38788335866.

Together with next prime (66853388837) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66853388783 - 2²⁰ = 66852340207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66853388683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33426694391 + 33426694392.

It is an arithmetic number, because the mean of its divisors is an integer number (33426694392).

Almost surely, 2^66853388783 is an apocalyptic number.

66853388783 is a deficient number, since it is larger than the sum of its proper divisors (1).

66853388783 is an equidigital number, since it uses as much as digits as its factorization.

66853388783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139345920, while the sum is 65.

The spelling of 66853388783 in words is "sixty-six billion, eight hundred fifty-three million, three hundred eighty-eight thousand, seven hundred eighty-three".