66857798311 has 2 divisors, whose sum is σ = 66857798312. Its totient is φ = 66857798310.

The previous prime is 66857798263. The next prime is 66857798321. The reversal of 66857798311 is 11389775866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66857798311 - 2¹¹ = 66857796263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66857798311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66857798321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33428899155 + 33428899156.

It is an arithmetic number, because the mean of its divisors is an integer number (33428899156).

Almost surely, 2^66857798311 is an apocalyptic number.

66857798311 is a deficient number, since it is larger than the sum of its proper divisors (1).

66857798311 is an equidigital number, since it uses as much as digits as its factorization.

66857798311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15240960, while the sum is 61.

The spelling of 66857798311 in words is "sixty-six billion, eight hundred fifty-seven million, seven hundred ninety-eight thousand, three hundred eleven".