266566220 has 24 divisors (see below), whose sum is σ = 560096208. Its totient is φ = 106568000.

The previous prime is 266566207. The next prime is 266566229. The reversal of 266566220 is 22665662.

It is not an unprimeable number, because it can be changed into a prime (266566229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67295 + ... + 71145.

It is an arithmetic number, because the mean of its divisors is an integer number (23337342).

Almost surely, 2^266566220 is an apocalyptic number.

266566220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266566220 is an abundant number, since it is smaller than the sum of its proper divisors (293529988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266566220 is a wasteful number, since it uses less digits than its factorization.

266566220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7321 (or 7319 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 266566220 is about 16326.8557903841. The cubic root of 266566220 is about 643.5787627624.

The spelling of 266566220 in words is "two hundred sixty-six million, five hundred sixty-six thousand, two hundred twenty".