66013284857 has 12 divisors (see below), whose sum is σ = 71638340220. Its totient is φ = 60801931008.

The previous prime is 66013284833. The next prime is 66013284947. The reversal of 66013284857 is 75848231066.

It can be written as a sum of positive squares in 6 ways, for example, as 4816915216 + 61196369641 = 69404^2 + 247379^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66013284857 is a prime.

It is a super-2 number, since 2×66013284857² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66013289857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 350132 + ... + 504597.

It is an arithmetic number, because the mean of its divisors is an integer number (5969861685).

Almost surely, 2^66013284857 is an apocalyptic number.

It is an amenable number.

66013284857 is a deficient number, since it is larger than the sum of its proper divisors (5625055363).

66013284857 is a wasteful number, since it uses less digits than its factorization.

66013284857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855212 (or 855199 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 66013284857 in words is "sixty-six billion, thirteen million, two hundred eighty-four thousand, eight hundred fifty-seven".