266223656 has 16 divisors (see below), whose sum is σ = 499551540. Its totient is φ = 133009920.

The previous prime is 266223647. The next prime is 266223667. The reversal of 266223656 is 656322662.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 261339556 + 4884100 = 16166^2 + 2210^2 .

It is a super-3 number, since 3×266223656³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001 + ... + 23096.

Almost surely, 2^266223656 is an apocalyptic number.

It is an amenable number.

266223656 is a deficient number, since it is larger than the sum of its proper divisors (233327884).

266223656 is a wasteful number, since it uses less digits than its factorization.

266223656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25484 (or 25480 counting only the distinct ones).

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

The square root of 266223656 is about 16316.3616042303. The cubic root of 266223656 is about 643.3029570941.

The spelling of 266223656 in words is "two hundred sixty-six million, two hundred twenty-three thousand, six hundred fifty-six".