266656223 has 4 divisors (see below), whose sum is σ = 271175880. Its totient is φ = 262136568.

The previous prime is 266656217. The next prime is 266656253. The reversal of 266656223 is 322656662.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322656662 = 2 ⋅161328331.

It is a cyclic number.

It is not a de Polignac number, because 266656223 - 2⁴ = 266656207 is a prime.

It is a super-2 number, since 2×266656223² = 142211082529251458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266656253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2259740 + ... + 2259857.

It is an arithmetic number, because the mean of its divisors is an integer number (67793970).

Almost surely, 2^266656223 is an apocalyptic number.

266656223 is a deficient number, since it is larger than the sum of its proper divisors (4519657).

266656223 is an equidigital number, since it uses as much as digits as its factorization.

266656223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4519656.

The product of its digits is 155520, while the sum is 38.

The square root of 266656223 is about 16329.6118447439. The cubic root of 266656223 is about 643.6511869196.

The spelling of 266656223 in words is "two hundred sixty-six million, six hundred fifty-six thousand, two hundred twenty-three".