66256865266 has 8 divisors (see below), whose sum is σ = 99549031680. Its totient is φ = 33073854708.

The previous prime is 66256865261. The next prime is 66256865273.

It is a happy number.

66256865266 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66256865266.

It is not an unprimeable number, because it can be changed into a prime (66256865261) 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 3 ways as a sum of consecutive naturals, for example, 27287446 + ... + 27289873.

It is an arithmetic number, because the mean of its divisors is an integer number (12443628960).

Almost surely, 2^66256865266 is an apocalyptic number.

66256865266 is a deficient number, since it is larger than the sum of its proper divisors (33292166414).

66256865266 is a wasteful number, since it uses less digits than its factorization.

66256865266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54577928.

The product of its digits is 37324800, while the sum is 58.

The spelling of 66256865266 in words is "sixty-six billion, two hundred fifty-six million, eight hundred sixty-five thousand, two hundred sixty-six".