66871710313 has 2 divisors, whose sum is σ = 66871710314. Its totient is φ = 66871710312.

The previous prime is 66871710263. The next prime is 66871710379. The reversal of 66871710313 is 31301717866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45023322969 + 21848387344 = 212187^2 + 147812^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66871710313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66871710313.

It is not a weakly prime, because it can be changed into another prime (66871210313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33435855156 + 33435855157.

It is an arithmetic number, because the mean of its divisors is an integer number (33435855157).

Almost surely, 2^66871710313 is an apocalyptic number.

It is an amenable number.

66871710313 is a deficient number, since it is larger than the sum of its proper divisors (1).

66871710313 is an equidigital number, since it uses as much as digits as its factorization.

66871710313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 66871710313 in words is "sixty-six billion, eight hundred seventy-one million, seven hundred ten thousand, three hundred thirteen".