266653306566655 has 8 divisors (see below), whose sum is σ = 319984799613552. Its totient is φ = 213322090764288.

The previous prime is 266653306566599. The next prime is 266653306566701. The reversal of 266653306566655 is 556665603356662.

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

It is a cyclic number.

It is not a de Polignac number, because 266653306566655 - 2⁴⁷ = 125915818211327 is a prime.

It is a super-2 number, since 2×266653306566655² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67189269 + ... + 71047198.

It is an arithmetic number, because the mean of its divisors is an integer number (39998099951694).

Almost surely, 2^{266653306566655} is an apocalyptic number.

266653306566655 is a deficient number, since it is larger than the sum of its proper divisors (53331493046897).

266653306566655 is a wasteful number, since it uses less digits than its factorization.

266653306566655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138622265.

The product of its (nonzero) digits is 3149280000, while the sum is 70.

The spelling of 266653306566655 in words is "two hundred sixty-six trillion, six hundred fifty-three billion, three hundred six million, five hundred sixty-six thousand, six hundred fifty-five".