66281818266 has 16 divisors (see below), whose sum is σ = 147292929600. Its totient is φ = 22093939404.

The previous prime is 66281818199. The next prime is 66281818277.

66281818266 is a `hidden beast` number, since 6 + 628 + 1 + 8 + 1 + 8 + 2 + 6 + 6 = 666.

66281818266 is nontrivially palindromic in base 10.

It is a super-4 number, since 4×66281818266⁴ (a number of 44 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 1227441079 = 66281818266 / (6 + 6 + 2 + 8 + 1 + 8 + 1 + 8 + 2 + 6 + 6).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613720486 + ... + 613720593.

It is an arithmetic number, because the mean of its divisors is an integer number (9205808100).

Almost surely, 2^66281818266 is an apocalyptic number.

66281818266 is an abundant number, since it is smaller than the sum of its proper divisors (81011111334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66281818266 is a wasteful number, since it uses less digits than its factorization.

66281818266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227441090 (or 1227441084 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 54.

The spelling of 66281818266 in words is "sixty-six billion, two hundred eighty-one million, eight hundred eighteen thousand, two hundred sixty-six".