66857798263 has 2 divisors, whose sum is σ = 66857798264. Its totient is φ = 66857798262.

The previous prime is 66857798221. The next prime is 66857798311. The reversal of 66857798263 is 36289775866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66857798263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66857798213) 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, 33428899131 + 33428899132.

It is an arithmetic number, because the mean of its divisors is an integer number (33428899132).

Almost surely, 2^66857798263 is an apocalyptic number.

66857798263 is a deficient number, since it is larger than the sum of its proper divisors (1).

66857798263 is an equidigital number, since it uses as much as digits as its factorization.

66857798263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 182891520, while the sum is 67.

The spelling of 66857798263 in words is "sixty-six billion, eight hundred fifty-seven million, seven hundred ninety-eight thousand, two hundred sixty-three".