266665834455 has 16 divisors (see below), whose sum is σ = 438196831584. Its totient is φ = 138377946240.

The previous prime is 266665834451. The next prime is 266665834549. The reversal of 266665834455 is 554438566662.

It is not a de Polignac number, because 266665834455 - 2² = 266665834451 is a prime.

It is a super-2 number, since 2×266665834455² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266665834451) 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 15 ways as a sum of consecutive naturals, for example, 240238936 + ... + 240240045.

It is an arithmetic number, because the mean of its divisors is an integer number (27387301974).

Almost surely, 2^266665834455 is an apocalyptic number.

266665834455 is a deficient number, since it is larger than the sum of its proper divisors (171530997129).

266665834455 is a wasteful number, since it uses less digits than its factorization.

266665834455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480479026.

The product of its digits is 124416000, while the sum is 60.

The spelling of 266665834455 in words is "two hundred sixty-six billion, six hundred sixty-five million, eight hundred thirty-four thousand, four hundred fifty-five".