266635555021223 has 4 divisors (see below), whose sum is σ = 266635854257448. Its totient is φ = 266635255785000.

The previous prime is 266635555021217. The next prime is 266635555021247. The reversal of 266635555021223 is 322120555536662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 266635555021223 - 2⁶ = 266635555021159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266635555020223) 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, 148277528 + ... + 150064973.

It is an arithmetic number, because the mean of its divisors is an integer number (66658963564362).

Almost surely, 2^{266635555021223} is an apocalyptic number.

266635555021223 is a deficient number, since it is larger than the sum of its proper divisors (299236225).

266635555021223 is an equidigital number, since it uses as much as digits as its factorization.

266635555021223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299236224.

The product of its (nonzero) digits is 19440000, while the sum is 53.

The spelling of 266635555021223 in words is "two hundred sixty-six trillion, six hundred thirty-five billion, five hundred fifty-five million, twenty-one thousand, two hundred twenty-three".